So I have been thinking of the 3 gal heated waterer that apparently tends to spill. I only have 4 birds and so 3 gal seems like overkill. I noticed in Backyard Poultry mag that the same company makes a 32 oz heated water bottle (Model # HRB-20) This seems like a better size and more economical to heat. Has anyone tried this? It is recommended for rabbits and the like - can chickens use that kind of tube-style dispenser of water? Here's a photo from a commercial website: Thanks for any opinions.