We have no avian vets but I was able to find a reg vet in the next county over from us who would see my duck. Thankfully, the 2 in our town don’t. Sometimes you have to be your own vet.
Any way you can add some kind of drain system? When we get a lot of rain and around the bucket area gets yucky I put white vinegar into the water buckets to clean them and pour that water over the area I want to clean up. It does help and it’s safe for the birds.
That's nice mulch. When I think of mulch I think of the big pieces that usually come in bags. That you showed @Runner duck mom is more like shredded. Much easier on the feet.