I use a 10 gallon tote with lid, stock tank heater that is safe to use in plastic, and horizontal nipples for my chicken water. It's been down to -4 F here without any sign of freezing. The high temperature for the day has been as low as 8 degrees. The outside faucet was converted to a freeze free one this summer so it's easy to take one of those shrinking hoses outside to water the chickens and fill the tank for the geese. Once everything is full the hose gets disconnected, put into a empty tote and brought into the house until the next week when everyone needs watered again. It got down to -12 F last winter and the chicken water never froze.