Hasn’t anyone heard the old advice, “don’t drink the water” in Mexico, et al?
And it was known long ago the best way to handle water was to boil it first. When people did not understand that, they didn’t drink straight water much but that is how they got into beer and wine. Not realizing the fermenting and cooking was making it safer.
For centuries the best was to handle water for those who could afford it was to drink beer or wine.