Right now I have a hardware store bucket with vertical poultry nipples on the bottom and a bucket deicer in the bottom of the bucket. Its keeping the water from freezing, but my birds are soaking themselves! My Silkie looked like a drown rat this afternoon. So, I need something that is going to do the following for us: - MUST withstand the cold temps (-40C) - Water needs to be clean (I like that nothing can get into my current set up) - Needs to be large (I have 9 birds and the water needs to be enough to last a few days at a time) - Needs to work for both bantam and large breed What is the best set up that will work for us??? All I keep hearing is a heated dog bowl, but I can see that getting filthy and needing to be washed and filled multiple times a day (which we don't have time for).