I can't find a better water system either. I have used the glass water fountain and Bob stuffs the opening so full of hulls the water can't come down into the dish area.
He has been doing the bad boy thing with his food less now that Tom is in with him, but he still thinks its funny to take his seed and crack it and put the hulls in the water dish.
I have taken to a regular hook on the cage dish for their water and I change the water no less than twice a day. Some days are better than others. Some days though I have to change the water 4 or 5 times, the little chit!
The more I complain to Bob not to do it, he does it more...so I have taken to saying nothing about it and it has gotten a little better as of recent. UGH!