Is she also urinating more frequently? Reggie drinks a ton of water and he urinates very frequently. When the vet tested him he did not have diabetes, but the vet said that is something that could cause that (and he also would be losing weight). So, not trying to worry you, but it is a possibility. But there are other things that could cause it as well, or, she could just be more active which is causing her to want to drink more.

Feces eating is called Coprophagia I found an article on it for you with some different causes/things to try to stop it. http://www.vetmed.wsu.edu/pets/_archive/study.htm

Good luck, I'm sure everything will be just fine with Josie!