What I do is I just take a lot of fruits, freeze them, and put them in a little kiddie pool that we have with some ice. I sometimes also put some toys in there with shrimp. Don't put too much in or it will over crowd the water but it will cool them down a lot. Another kind of more useful and fun for sub adult to adult ducks or chickens is to take an automatic dog feeder, put it on some bricks where the bottom part is underwater and I would have it low enough to make it wide enough for fish to get out. Then I would fill it with about a thousand minnows and water depending on which dog feeder I'm using, and every hour probably 100 to 150 will get out into the pool and it will be entertaining to watch but also be great for chickens, turkeys, ducks anything. Sorry this is so long but yeah.