I would get the 15 quart tub and attach a small uth on it with foil tape. Do not use peel the paper off the uth and stick it on then you will not be able to take it off! You can use anything for a hide as long as it is just big enough for the bp which a baby is pretty small. You can use a plastic cat/dog dish and turn it upside down and cut a hole in it. Burn the edges of the hole so they are not sharp. The dollar store is a great place to get hides and water dishes!