One thing that makes them like their water is mixing some apple juice or I think (please correct me if I am wrong someone) cranberry juice in with the water. LIke 50/50.
And also leave a container of regular water in their too. So you Will have two water bottles.
It could be he's not eating cuz you are still using CC, so that could be enough to fill him up, but I'm not sure on that one. I just know that when I took Noel off it, I just took her off CC and she started eating on her own again. You can also try, which i wouldn't give alot of cuz i hear it has too much calcium, but some alpha hay, they really like that. YOu can maybe sprinkle some on top of her timothy hay.
I haven't had chins as long as some people, but those are some ideas. Hope they help out, and I'm sure people will correct me if I'm wrong.
Good luck,
Jean