The parent comment was of course sarcastic. However, your trip savvy list is seven countries long.

The US does not have the best tap water in the world, I think everyone here can guess that already. It does have extremely safe tap water overall however, save for a few examples like Flint (and fracking regions in West Texas or Oklahoma, both of which get bad ratings on water violations). Its rate of serious drinking water violations is low nationally going back over the last 20-30 years.