Weird, White, and Fuzzy in the Water Bowl!

[Whistly]

When I had a little water bowl I noticed white fuzzy things but never as big as you've described and they were small patches on a submerged piece of wood. I'd hazard a guess at some kind of mould, the other material is probably organic matter that started decomposing in the water, once again this happened to me as some unlucky bugs that fell in the water didn't get out.

I'd give the water bowl a thorough cleaning with cleaning products and then wash it just in hot water and wipe it dry until 1beataway thinks it's clean. Maybe bake it in the oven if she feels that it's not clean enough.