I was in Mexico for December, January and February.  I took long, hot showers every day.  I started getting a rash after a couple of months, but didn't understand why.  I thought maybe there were fleas in some of the hotels I was staying in.
I kept taking long, hot showers.
The full-body rash, still hasn't gone away.  I think it was caused by the Mexican water.
The public water in Mexico, with very few exceptions, or maybe even no exceptions, is real bad.
Maybe worse than countries I've traveled in that are even more third-worldy, Cambodia for instance.
I lived in New York City for decades and drank tap water every day.  NYC has some of the best tap water in the world, especially considering that it sits at sea level.
The water comes from upstate aquifers which are heavily regulated.  They're working on a third water tunnel now.
People who live in countries with clean tap water should be grateful.