Its 'liquid', not 'water'.
Obviously water is better, the ENT person who posted upthread makes the point that there is a difference in how the body is in people who solely drink tea and coffee as their liquid (me) and people who drink water. I was told this myself, it applies to me, but I just cant drink water, I cant get it down me
People say ' 2 litres of water a day', its 2 litres of liquid a day (not booze obviously!)
So that you are regularly flushing through liquid in your kidneys, your wee should be 'the colour of pale hay' - I saw it referred to as this once! A sort of very soft, pale greeny colour, no yellowing to it
YOu also get liquid from foods so people that eat a lot of salads and fruit will have moisture from these too. I notice when I eat more carbohydrate foods compared to high protein I wee more and my wee is paler.
Im advised by the nursing team Im under to have 2 litres but never ever have I reached that goal.