I use horizontal nipples in a 14 gallon drum in my run and I have a 5 gallon bucket in my coop. I put a stock tank deicer in my 5 gallon bucket during Jan and Feb, so the water doesn't freeze. I don't use the drum for those 2 months.
https://www.backyardchickens.com/ar...ock-tank-deicer-and-horizontal-nipples.74609/
https://www.backyardchickens.com/ar...ock-tank-deicer-and-horizontal-nipples.74609/