Well, we went to the vet on Saturday, and everything seems to be okay. She put him on different anibiotics (he was on something because of a bactieria infection on his head) so we switched that. She seems to think that he's having too much fun playing in the water, and to limit his water. So that's what I've been doing, and so far, so good. He did have the 'other' accident this morning, I don't know what that was all about. He's been pretty good about going outside for that since we got him, but we all make mistakes... hopefully that's all it was I'm glad it wasn't diabetes, that would have broke my heart. Thanks for your input everyone!