I feel rather stupid for not mentioning it but it is very important that the water dish is removed and hand clean/scrubed out. In the past I've gotten lazy and simply wipe the plastic water dish out with a paper towel and called it good. it wasn't good enough.
I'm not sure if the issue is with my water or the interaction of the water with the plastic but a thin film of slime(only word to describe it) develops on the dish and the only way I can get it out is to scrub it out with a brush.
I keep plenty of scrubbed water dishes of all sizes ready to just exchange with the dirty one. This allows me time to scrub them clean at a later time.