Water Obsessive Dog, Looking for “Slow Feeder” for Water?

Hello,

I have a dog I rescued a few years back that has some serious water issues. Not in the same way some dogs drink too much water when hot and throw up. It is his biggest fixation. We think he was left outside for extended periods of time based on some other physical and behavioral traits and developed a habit of drinking ALL the water available when it was around. He also seeks water anywhere like drinking from puddles and toilets, obsessively consuming snow, sniffing out peoples water bottles and even the water mains in the ground on walks. When provided an open source of water he will tucks his tail and drink until it is gone, licking every last drop. When we used to provide water like this he would drink it so fast his body couldn’t absorb it. He would pee for 40secs to a minute straight, leak pee even if he peed a couple hours before and wet the bed during the night. We had him tested for diabetes but he came back negative and has no other health issues that would indicate something else is wrong. We have since had to limit his water intake by calculating how much water he needs, storing it in a bottle and providing it periodically throughout the day. Since then, his urination habits have normalized and it’s working well overall but I would really like him to have a source of water when we are out of the house. We have tried one of those water bowls with a floating insert for “messy drinkers” thinking less visual water would help but he does the same thing. We’ve tried blocks of ice but he licks them till his tongue is raw. I’ve even resorted to trying a hamster bottle but he just stands there and, again, licks his tongue raw. I’ve looked online but can only find gravity water dispensers and fountains which would worsen the problem.

If anyone has any recommendations for how to provide him a water source when he is alone without allowing him to drink too much too fast, like something with a timed release, I would really appreciate it. Or if anyone even has some medical idea of what’s going on and wants to provide information I can bring to the vet, I’d love that too. I’m even down for a Rube Goldberg machine at this point if anyone has ideas.

Thank you!

TLDR: Dog drinks too much water too fast and can’t absorb it, leading to pee problems. No obvious medical conditions. Want to provide a limited water source and need help!!