That is fantastic. I live in a pretty cold climate so I am not sure I'd be able to keep those from freezing. But they are great for summer. I want to try something like that in their outdoor run.
I just bought this 5 gal waterer--see link.
http://www.tractorsupply.com/chicken-equipment/farm-tuff-top-fill-poultry-waterer-5-gal--2167442
I wish I had read the reviews before I wasted $33 on this thing. It is either completely closed and doesn't give out any water at all, or it leaks all...