If I am cooking in a crock pot (chicken) do I have to put water in with it?

No, I've cooked chicken and also turkey legs without water, just a little olive oil on the bottom so it doesn't stick, there is enough moisture in it to roast it. But one warning, if it looks like it is sticking or you want to add water later, don't put cold water or the crock will break. Actually the chicken tastes better without water, almost like a tagine.