I couldn't find the old topics that I know are out there so I can't give you a link or anything. You still may find them with a search, I didn't try very hard.
Anyway I think pooping in the bowls sometimes happens because the bowls are too big. Water bottles are sometimes recommended to solve the problem but you should be aware that there are risks of injury to the mouth and tongue and teeth from using the bottle and some hedgehogs will never adjust to it.