I need to come up with a solution for going away a night or two over the holidays and keeping my chickens water from freezing while we're gone. The obvious choice would be one of those heated water bowls but I'm concerned because the bowls that are sold at my local feed store have a warning on them that says "do not use with extension cords". The set-up I'm dealing with is basically this; my 3 chickens are in a small tractor-like set up, that I mount up on haybales during the winter, and it's located just outside our back door, so if I were to use a heated water bowl, the cord would have to be plugged into an extension cord which would then run either through the back door or a window next to the back door, and plugged in in the entryway outlet in the house. Does this sound like a fairly safe option, or would I be asking for trouble? Does anyone else use one of these bowls with an extension cord, or is there a type of bowl out there that is okay for use with extension cords? Any advice would be appreciated since I made the whole family mad last year when we got up at 3:30 am last Christmas morning and sped home to give the chickens water!