In Bali, do not assume an unfamiliar bathroom tap supplies drinking water. If you cannot verify it, brush and rinse with unopened factory-sealed bottled water or properly treated drinking water. Set that water beside your toothbrush.

A hotel may provide treated drinking water, but the word filtered is not enough information. Ask which outlet is intended for drinking and how the system is maintained. A bathroom tap and a designated refill station may differ.

Think through three moments: bathroom, refill bottle and cafe. Use a reliable water source for each. Ice also needs a safe source; a clear cube or an expensive-looking venue does not verify how it was made.

Keep a small supply where you will need it, including a late arrival. Carry a clean bottle and avoid mixing an uncertain refill into known drinking water. The practical goal is to make the safer choice convenient.

Accidentally using a little tap water does not prove you will become ill. It also does not verify that source for future use. Return to a reliable water plan and seek appropriate care if concerning symptoms develop.

Ask your accommodation: which water can guests drink, and how is that source treated and maintained? If the answer remains unclear, use sealed bottled or appropriately treated water. The article includes a simple arrival checklist.