I've read this entire post and found it to be really informative.
The past couple of years, I have had a real problem with the water freezing so twice a day I would have to trudge through show to get to the coop, get the waterer, break up ice and add fresh water then take it back out to the coop. It was a real chore.
After reading this thread, I have decided to try this set up for water.
The only question I have is, how do you keep the waterer on top of the tin? My girls are very playful with each other and I would be afraid they would knock it off and water will get every where. I was thinking about some sort of spring going from the tin, over the top of the waterer (which is 3.5 gal plastic) and then reconnecting it to the tin. Does that sound like it would work?
Thanks for the input.