Can you drink tap water in Bali?
The protocol that works
Drink only sealed bottled water or water from the big blue refill gallons (every villa and guesthouse has one - refills cost about 20,000-25,000 IDR and save a mountain of plastic). Coffee and tea are fine: the water is boiled. Restaurant and bar ice in tourist areas is commercially produced tube ice under health regulation - the cylindrical kind with a hole (bali.com, Finns). Cloudy hand-crushed ice from an unknown street cart is the one to skip.
Brushing teeth, showers, salads
Brushing with tap water and spitting is low-risk for healthy adults; children, pregnant women and anyone immune-compromised should use bottled (Bali Villa Hub). Showers are a non-issue - just do not gulp. Salads and cut fruit in reputable cafes are washed in treated water; the wellness-cafe scene lives on raw bowls and would not survive poisoning its regulars. At street level, choose cooked and busy.
If you slip up
One accidental glass is usually nothing - most stomachs handle a small exposure fine. If your gut does rebel a day or two later, that is the classic onset of Bali belly; hydration and rest fix most cases in 48 hours. We wrote the full playbook in how to avoid Bali belly.
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