We have always just used the tub and filled it with just enough water for them to float. We always watch them when they are little and only give them a few minutes at a time to start. Then we take them out and dry them off a bit before putting them back in the brooder. I've never had an issue with the little ones trying to jump out, but plenty of issues with rehabbing hens trying to make a run for it when they have had enough.