I was thinking about this the other day.
I would probably want to have drinking water in a separate container, it could very well simply be a water jug from the store. I would carry multiple of those with me and replace one when needed. That way I would always have fresh water to drink, not something that has sat in the main tank for days.
Water in the main tank would be used in cooking (boiled) and washing as usual.
My initial idea was pretty much having a water jug on it’s side in the overhead locker and a spigot attached to the cap. Can’t beat gravity.