[smudgie]

Varies. I am supposed to drink at least two litres a day of water, but tend to put juice in it, struggling with it at the minute so drinking 2 litres a day of cheap diet coke instead.
Normally drink average 3 mugs of coffee a day as well, my doc is quite happy to count that as a fluid intake as well nowadays.
My kidney function gets checked on a very regular basis so well so it would show if I wasn't doing well.