I think I'm going to just chuck my big 3-gallon waterer (pictured here: http://www.mypetchicken.com/Feed_and_Feed_Supplies-3_Gallon_Hanging_Plastic_Waterer-P29.aspx ) which is currently inside their coop/tractor... And just use these inside the coop as well as outside ( http://www.redoakgamebirds.com/shop/index.php?act=viewProd&productId=94 ) The big waterer inside the coop gets filthy so quickly that the chickens hardly use it. On the other hand, I've been using the "pop bottle" waterers out in their run very successfully - they stay pretty clean and I can put out a bottle of frozen water for them on these 95* days, which they seem to like. I have a very small flock, so they won't go through more than 1/2 gallon per day, and much less inside the coop since they only sleep and eat in there. Any concerns or ideas I haven't considered? eta: the 3-gallon waterer actually works very well, it's just so big and cumbersome to use (especially in my small chicken tractor), irritating to clean and refill constantly, and gets murky too quickly.