Hose Faucet Water Timer for Outdoor Garden, Ortis Programmable Sprinkler Timer with Rain Delay/Manual/Automatic Mode, IP67 Leak-Proof Design for Lawn Yard, 1 Outlet

I'm going to take your word for it that's he's healthy and focus on your actual question. I'd go with a water bowl with a float like this https://www.amazon.com/dp/B0CB7PH2Z9 that can be adjusted to whatever level you want. Then add a timer like this https://www.amazon.com/dp/B0GKDR9JGZ that you can set it to hourly or whatever. Have it open for however long it takes to fill the bowl from empty and then close until the next interval. This combination would allow you to fill the bowl at set intervals and not refill outside of the set times.