Fresh Water
We never drink the water in the fresh water tank in our motorhome. We are always at a location where it is a whole lot easier to just plug the hose into the system, by-pass the fresh water tank and not mess with keeping it fresh. It is a lot of weight to carry, also, if you fill it up at home and drive with it full. Actually, we never drink the water from the system at all ( I do once in a while, if making coffee), but normally we use bottled water for drinking (58 cents a gallon from Wally World). We do use system water for bathing, doing dishes, cleaning, toliet flushing, etc.
I do have a fresh water tank on my boat that is 22 gallon and I treat it with purification tablets, but still never drink it. The only way I would ever drink from the fresh water tank is if I am out in NoMan's land and can not hook up to local water.
Sorry, Guess I really didn't answer your question... :disapprove: But did give you my view.