Thanks, but let me try this from a different direction.
I estimate Nano to be consuming about 250 mL (= 1 cup = 8 fluid oz) of water a day. (So Nano is urinating half of what Merlin is doing.) She is 6-8 year old female cat who weighs 14 lbs but I am going to put her on a canned food diet to get down to 11-12 lbs. Is 250 mL of water going through her system each day good enough or should I try to get her to take more?
Is there some formula for cats? For instance, humans are supposed to drink half an ounce per day for each pound they weigh.
There are no emergencies or health problems here. I am just asking for curiosity and information.