Get a plastic kiddie pool and trim it so it's only a few inches tall. Works beautifullyWe have plain water in the coop, which they have access to all the time and the other water is outside in the run. I would like to get something small and put some ice chunks in it as I have seen your photos before and think it is a great idea. Sleds aren't available down here though lol... I will have to get an under the bed storage container. I freeze bottles of water to put in their water containers but I'm sure would work just fine in a "wading container".
Thanks for the suggestion of save a chick. I might still have some of that around here but if not, I will order some ASAP.