長期飲用生水會唔會生蟲?

如果是自來水(即是家中的), 正常是不會的, 可是由於水管生锈的問題, 就會有影響; 如果飲用山水(未經處理的), 就會喇
水肚不服主要係因為水源不同而引起腸胃敏感的關係

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希望對你有參考價值！

It's best not to drink it, but a little here and there isn't going to kill you. I think there's some bacteria in the water everywhere, but it probably won't kill you. but it may not vomiting.

Yes, because there are different kinds of micro-organisms in the water if not filtered or boiled. Maybe you'll get diseases including parasites.
Well, 水肚不服is when you go to other countries to drink & eat, you don't adapt other countries' water or food.