Is it normal to share bath water?
Depends.It depends
Some people share bath water, especially in families where one person bathes after another; other people find it unhygienic. It’s mostly a matter of household habit and comfort, with a few sensible exceptions.
Yes, some households reuse bath water or have people bathe one after another in the same water. In other homes, everyone gets fresh water, so reactions vary—it’s not a universal norm.
The main issue is what’s in the water: it’s better not to share if someone has diarrhea, an active skin infection, or an open wound. Otherwise, for healthy people, sharing bath water is generally more of a personal preference than a big hygiene concern.