When the safety of drinking water is questionable, boil it, or if this is not possible, disinfect it with a reliable, slow-release disinfectant agent (usually available at pharmacies).

当对饮用水的安全性存疑时，将水烧开，或者当不能做到这一点时，利用可靠的缓释消毒剂(通常在药店可以买到)对水进行消毒。

youdao

I took a travel kettle and travel plug to boil water with me in Malta as well as drinking water from bottles.

我拿了一个旅行水壶和旅行插头烧水与我在马耳他以及从瓶饮用水。

youdao

There we prepared to dry our clothes over a fire and boil some drinking water.

我们准备在那里把衣服烘干，烧点水喝。

youdao

There is still no sign of contamination, White said Sunday, but he asked that residents continue to drink bottled water or boil tap water before drinking it.

CNN: Ike damage prompts weeklong curfew in Houston

Those served by the reservoir were warned to boil their tap water before drinking or using it to prepare food, brush teeth or bathe babies.

BBC: Late warning for water customers