I started off with a water bowl that Enkou just ran through and otherwise ignored. So I've just been doing regular soaks and he seems fine. I'm thinking I'll need to get an eyedropper in case, but for the most part I dribble a little water by hand on his nose and he licks it up, or he just soaks. Hasn't been a problem so far. I also sometimes add a little extra moisture in his salads, like drizzling a little water on the top after putting them in his bowl, so when he eats his greens he's getting some water off of there.