I know how you feel about not being sure if your cat is getting enough to drink. We have had Buffy in the cattery a couple of times since we have been in Traralgon, and when she came home the first time she would not drink out of her bowl.(She still doesnt.) She would jump up onto the bathroom sink and wait for you to turn the tap on and then drink.(She still does.) I think it has something to do with smells of other cats and the still water. (Well, thats my theory.) Since Neptune came from the RSPCA shelter, he might have a similar hang up to Buffy.