4 hours without water isn't bad. We never left water in the crate, but he was never in the crate longer than 3 hours with us. When it came to bed time, we'd pull water about 30 minutes before bed, take him out one more time, let him do his business, and then off to the crate for bed. While sleeping...they don't need water. Bed was around 11 and I'd be up around 5:30 or 6:00 for his first walk. We'd go out, then he would get water. Water was always available if we were home and he was out and about. Just had to monitor how often and how much he drank and then take him out after a big drink.