I wouldn't say it's a treat, but it will do the trick in a pinch.water didn't freeze today and they ate some snow when I let them out lol so they seem fine. They love the ice and snow well they like eating it so I'm gonna guess the frozen water is a treat for them. thank you all for the suggestions and help.
I've used bowls of snow for back up, works fine.
Heated water consumption goes down when there is fresh snow on the ground.