Here is DocDoc (Doctor- named after Doctor Who) sprawled under the water bottle. He hangs out like this a lot, but this time he looked particularly ridiculous. He's lying on a square of rock tile which keeps the cage liner from moving and provides a very cool place to lie although not soft.
I will have to try to get a picture of what happens when another rat wants a drink. Honestly, he won't move. They will be lapping away, standing on him.