>>76404305Besides the other answers that anons gave, which account for most of it, the water here is fluoridated, and there is probably a natural aversion to drinking it. Whenever I go back home, I can happily subsist on tap water, but while I'm here in the US, something about the tap water makes me feel worse, and I'd prefer drinking sparkling water which I buy.
I'm pretty sure they also poison the air supply in apartment blocks, and possibly buildings in general.