Is that why the American tourists in Europe always ask if tap water is drinkable?
And then I told the rest of America to watch out for the water in Europe. So it’s me; I’m the reason.
I've had my fair share of stomach discomforts while travelling, but I'm very unlikely to associate it with tap water unless I do a controlled self-study.
More often its clearly from food prepared in unhygienic conditions, because that's the only variable during my travels and tap water is the norm for me.