I have one of these that I used last year, worked out well
http://www.amazon.com/Farm-Innovators-R-19-Economical-2-Gallon/dp/B000FJX7YW/ref=sr_1_4?ie=UTF8&qid=1445963938&sr=8-4&keywords=heated+pet+bowl
Did you just put the water in and use it that way or did you convert it somehow to heat a chicken waterer?