I finally found someone to see him (my rescued macaw who drinks double the volume of water my other one does and thus squirts out a lot of watery poops). This vet initially also thought kidney disorder but did a full and expensive workup including blood tests and determined no kidney ailment and no diabetes but highly suspects a tumor on his pituitary gland can cause this. She said there isn't a cure but I could prolong his life by using either soft water or bottled water instead of our well water. Just passing this on as I suppose you could also try a water source change if it's hard water.I suspect a kidney disorder, only because your hen's acting abnormal to drink that much water. Her symptoms are the exact same as one of my rescued macaw parrots. I had to put a kitty litter box under where he poops, as there's no way I can keep his cage clean with as much water as he poops. He drinks double what the other one does. He's been doing this for a while now. I'm waiting to hear back from three vets I've emailed to see if someone can see him and properly diagnose it. Online parrot "vets" agree it's a kidney disorder of some kind. If I ever find out for sure, I'll let you know.