Bali Belly Prevention: 15 Tips Travelers Need to Know

Bali belly affects roughly half of all international travelers to Indonesia, but it doesn’t have to ruin your trip. With the right precautions, you can dramatically reduce your risk of getting sick. Most cases of bali belly are entirely preventable once you understand the common routes of infection and the practical steps to avoid them.

This guide gives you 15 specific, actionable bali belly prevention tips that our medical team at Revivel Life recommends to every traveler who asks how to avoid getting sick. We treat bali belly cases across Bali every single day, so we know exactly which mistakes lead to the most infections, and how to prevent them. For a full overview of what bali belly is, how long it lasts, and the best treatments if you do get sick, see our complete Bali Belly guide.

Why Travelers Get Bali Belly (and Why Prevention Matters)

Your gut has a microbiome that’s adapted to the food, water, and bacteria in your home country. When you arrive in Bali, your digestive system encounters a completely different set of microorganisms. Bacteria like E. coli, Salmonella, and Campylobacter are the most common causes, and they enter your body through contaminated water, improperly handled food, or simple hand-to-mouth contact.

Bali’s tropical climate makes things harder. High temperatures and humidity above 80% create an ideal environment for bacteria to multiply rapidly on food surfaces. Add in Bali’s vibrant street food culture, the use of tap water in food preparation, and the sheer volume of unfamiliar ingredients, and you have a perfect storm for traveler’s diarrhea.

The good news is that most of these risk factors are manageable. You don’t need to avoid local food entirely or eat at tourist-only restaurants. You just need to be strategic about what you eat, where you eat, and how you handle hygiene. Here are 15 ways to do exactly that.

Water and Beverage Safety

1. Never Drink the Tap Water

This is the most fundamental rule of bali belly prevention. Tap water in Bali is not safe to drink, period. Studies have found E. coli contamination in over 60% of untreated water sources across the island. Always drink sealed bottled water, and check that the seal is intact before opening. Refillable water stations (found in many hotels, co-working spaces, and eco-conscious cafes) use purified water and are generally safe.

This also applies to brushing your teeth. Use bottled water for brushing, especially in budget accommodations where bathroom taps may not have filtered water. It takes just a small amount of contaminated water to trigger an infection.

2. Know Your Ice

Ice is one of the sneakiest sources of bali belly. Not all ice in Bali is made from purified water, and you can’t always tell by looking at a glass.

Generally safe ice: Tube-shaped ice or ice with a hole through the center is commercially produced from purified water. Most mid-range to high-end restaurants, cafes, and beach clubs use this type. Large, uniform ice cubes from commercial suppliers are also typically safe.

Higher-risk ice: Crushed ice, irregularly shaped ice chunks, or ice from small warungs with limited refrigeration. These are more likely to be made from tap water or handled with bare hands.

If you’re unsure, order drinks without ice. You can always ask the staff where their ice comes from, and most reputable establishments will tell you it’s from a purified supplier.

3. Be Careful with Fresh Juices and Smoothies

Bali’s juice and smoothie bowl culture is incredible, but it comes with a caveat. Fresh fruit juices and smoothies are only as safe as the water and ice used to make them. Reputable cafes in Canggu, Seminyak, and Ubud typically use purified water and clean ice. Roadside juice stalls or very small warungs may not.

If you’re ordering a juice from a place you’re unsure about, ask them to make it without ice, or choose a bottled option. For the first 2 to 3 days of your trip, while your gut is still adjusting, it’s worth being extra cautious with fresh juices.

Food Safety

4. Follow the “Cook It, Boil It, Peel It, or Forget It” Rule

This classic traveler’s guideline from the World Health Organization still holds true. Foods that are freshly cooked at high temperatures, boiled, or peeled by you are significantly safer than raw or pre-prepared foods. The heat from cooking kills the bacteria that cause bali belly. Raw foods that have been washed in tap water, sitting at room temperature, or handled by multiple people carry a much higher risk.

This doesn’t mean you can never eat a salad in Bali. Many restaurants in tourist areas use purified water to wash their produce. But during your first few days while your gut is still adjusting, sticking to cooked food is the simplest way to stay safe.

5. Choose Busy Restaurants and Warungs

High turnover means fresh food. A busy warung or restaurant that’s constantly cooking and serving customers has ingredients that haven’t been sitting around. An empty restaurant with a full buffet that’s been out for hours is a red flag.

Look for places where you can see the food being prepared and cooked in front of you. Local warungs with a constant stream of Indonesian customers are almost always a safer bet than a quiet restaurant trying to attract tourists with pictures on the menu.

6. Be Strategic About Street Food

Street food is one of the best parts of visiting Bali, and avoiding it entirely would mean missing out on incredible flavors. The key is choosing the right stalls.

Good signs:

• Long queue of local customers (locals know which stalls are safe)
• Food is cooked to order in front of you
• High turnover, ingredients look fresh
• The cook handles money separately from food (or has someone else handling payments)
• Clean cooking surfaces and utensils

Warning signs:

• Pre-cooked food sitting at room temperature for unknown periods
• Flies on the food
• No visible handwashing or glove use
• Very low foot traffic (food may not be fresh)

7. Be Cautious with Raw Salads and Uncooked Vegetables

Raw vegetables and salads are one of the most common sources of bali belly because they’re often washed in tap water. The bacteria survive on the surface of leaves and vegetables when they’re not properly washed with purified water.

At higher-end restaurants and well-known cafes in tourist areas, raw salads are generally safe because these establishments use purified water for food preparation. At smaller warungs or roadside stalls, stick to cooked vegetables to be safe.

8. Peel Your Own Fruit

Bali has incredible tropical fruit, including mangosteen, dragon fruit, papaya, mango, and rambutan. Fruit with a thick peel that you remove yourself is safe because the bacteria stay on the outside. Pre-cut fruit from market stalls or buffets carries more risk because it may have been cut with a knife that touched tap water or handled with unwashed hands.

Buy whole fruit from the market and peel or cut it yourself with clean hands and a clean knife. It’s cheaper, fresher, and safer.

Hygiene and Habits

9. Wash Your Hands Religiously

Hand-to-mouth transmission is one of the most underestimated causes of bali belly. Bacteria accumulate on door handles, menus, money, motorbike handles, ATM buttons, and phone screens throughout the day. Every time you touch your face or eat with your hands without washing first, you’re introducing those bacteria to your digestive system.

Wash your hands thoroughly with soap and water before every meal and after using the bathroom. When soap and water aren’t available, use hand sanitizer with at least 60% alcohol content. Carry a small bottle with you everywhere in Bali, because not every restaurant or warung will have a handwashing station.

10. Carry Hand Sanitizer Everywhere

This deserves its own tip because it’s that important. A small bottle of alcohol-based hand sanitizer is the single most practical bali belly prevention tool you can carry. Use it before eating, after handling money, after touching shared surfaces, and whenever you can’t get to soap and water. Buy it at any Mini Mart, Circle K, or Apotek across Bali.

11. Be Mindful of Shared Condiments and Utensils

Communal sambal jars, sauce bottles, and shared utensils at warungs and restaurants are touched by dozens of people every day. The condiments themselves are usually fine (most sambals are acidic or spicy enough to inhibit bacterial growth), but the exterior surfaces of jars, bottles, and shared spoons can harbor bacteria. Use sanitizer before eating after touching shared items, or ask for individual portions of condiments.

Gut Health and Supplements

12. Start Probiotics Before Your Trip

Research published in the Cochrane Database of Systematic Reviews supports the use of probiotics for reducing the risk and duration of traveler’s diarrhea. The most studied strains for traveler’s gut health are Saccharomyces boulardii and Lactobacillus rhamnosus GG.

Start taking a quality probiotic supplement 1 to 2 weeks before your trip and continue throughout your stay. This gives the beneficial bacteria time to establish themselves in your gut before you’re exposed to new pathogens. Probiotics won’t guarantee you won’t get bali belly, but they strengthen your gut’s defenses and can reduce the severity of symptoms if you do get sick.

13. Ease Into Local Food Gradually

One of the most common mistakes travelers make is diving into Bali’s full food scene on Day 1. Your gut needs time to adjust to new bacteria, spice levels, and ingredients. Going from your home diet straight to a night market feast with grilled seafood, spicy sambal, and tropical fruit is a shock to your system.

A smarter approach for your first 2 to 3 days:

• Eat at established restaurants with good hygiene
• Choose cooked dishes over raw ones
• Go easy on spice levels (you can increase gradually)
• Avoid the richest, most adventurous options until your stomach has adjusted
• Eat smaller, more frequent meals rather than large feasts

By Day 3 or 4, your gut has had time to start adapting, and you can explore more adventurously with lower risk.

14. Go Easy on Alcohol, Especially Early in Your Trip

Alcohol irritates the gut lining, reduces stomach acid (which is one of your body’s natural defenses against bacteria), impairs your immune system, and causes dehydration, all of which increase your vulnerability to bali belly. A night of heavy drinking in your first 48 hours in Bali is one of the most reliable ways to end up sick.

This doesn’t mean you can’t enjoy Bali’s cocktail scene. Just pace yourself during your first few days, stay hydrated between drinks, and avoid drinking on an empty stomach. Local spirits like arak can be especially harsh on a gut that’s still adjusting. Choose quality cocktails at reputable bars over cheap mixed drinks of unknown provenance.

15. Stay Hydrated with Clean Water Throughout the Day

Proper hydration is both prevention and first-line treatment. Your body needs significantly more water in Bali’s tropical climate than it does at home. Dehydration alone weakens your gut’s defenses and makes you more susceptible to infection. Aim for at least 2.5 to 3 liters of purified water per day, more if you’re active, spending time in the sun, or drinking alcohol.

Carry a reusable water bottle and refill it at purified water stations, which are widely available across Bali. Many hotels, villas, and co-working spaces provide complimentary purified water. Coconut water is also excellent because it provides natural electrolytes alongside hydration.

What to Do If Prevention Fails

Even with perfect precautions, bali belly can still happen. Your immune system is encountering thousands of new microorganisms, and sometimes a small exposure is enough. If you do get sick, early and aggressive treatment makes all the difference.

• Start rehydration immediately. ORS sachets are available at every pharmacy in Bali. Begin sipping as soon as symptoms appear.
• Follow the BRAT diet (bananas, rice, applesauce, toast) once you can keep food down.
• Rest. Cancel your plans and let your body fight the infection.
• Consider IV therapy if you can’t keep fluids down. Our Bali Belly IV treatment delivers hydration, electrolytes, and anti-nausea medication directly into your bloodstream. A nurse comes to your accommodation, and the treatment takes 30 to 60 minutes.
• Know when to see a doctor. Blood in your stool, high fever lasting more than 48 hours, or inability to keep fluids down for 6 or more hours all warrant medical attention.

For a detailed look at how long bali belly lasts and the full day-by-day recovery timeline, check out our dedicated recovery guide. And for information about IV drip options beyond bali belly treatment, browse our full IV drip catalog.

Frequently Asked Questions

Can probiotics really prevent bali belly?

Probiotics can reduce your risk but won’t eliminate it entirely. A meta-analysis in the Cochrane Database of Systematic Reviews found that certain probiotic strains, particularly Saccharomyces boulardii, reduced the incidence of traveler’s diarrhea by approximately 8% to 15% and shortened the duration of illness in those who did get sick. Start probiotics 1 to 2 weeks before your trip for the best protective effect. They’re most effective when combined with food and water safety practices.

Is it safe to eat street food in Bali?

Yes, with smart choices. Street food is not inherently unsafe. The risk depends on how the food is prepared, stored, and served. Choose stalls with high turnover, food cooked to order in front of you, and a steady stream of local customers. Avoid pre-cooked food that’s been sitting at room temperature. Many travelers eat street food throughout their trip without any issues by following these guidelines.

Should I take Imodium before eating risky food as a preventive measure?

No. Anti-diarrheal medications like loperamide (Imodium) are not preventive medications. They work by slowing gut motility, which means if you do get an infection, they trap the pathogen inside your intestines and can potentially make things worse. Imodium should only be used as a short-term symptom management tool during mild bali belly and never for cases involving fever or bloody stools. Probiotics and good hygiene are your best preventive tools.

How long does it take for your stomach to adjust to Bali food?

Most travelers find their gut begins adjusting within 3 to 5 days. The first 48 to 72 hours are the highest risk period because your microbiome hasn’t had time to adapt to the new bacterial environment. By the end of your first week, your gut has typically developed some tolerance to local microorganisms. Easing into local food gradually during the first few days rather than diving in all at once gives your microbiome the best chance to adapt smoothly.