I've never had an issue getting Odin to drink water. Getting him to swallow that last gulp is a different story...he likes to hold it in his mouth and then deposit it on his closest victim. My little sisters actually try and hide when they hear him drinking. After a long walk or hard play, he will sometimes wait until he catches his breath/cools down, but he eventually will go get a drink. You might also try giving her "treats" that will rehydrate her. One of Odin's favorite treats is watermelon. It's great during the summer when he needs a little extra water.