At the start of winter I asked around about what people were doing to keep their flock watered in the winter. Unfortunately none of the options really worked for my situation. My birds are divided into 8 different pen, by breed. Therefore it would be too costly to run heaters to all of the automatic waters that I use during the spring/summer/fall. Finally I came up with a solution and so far has worked really well for me. I decided to get 'coop cups' for each pen, similar to the ones here found on amazon: http://www.amazon.ca/Ethical-Stainl...S370/ref=sr_1_2?ie=UTF8&qid=1359161006&sr=8-2 I also have the 20 oz model. This worked for me because -It didn't take up much space -easily attaches and detaches from the hardware cloth -are easy to clean -hold enough water I water my birds twice a day, once in the morning and once late afternoon. If the bowls have frozen then I take the bowl out of the hanger and bang it out into a separate bucket. Since the bowls are stainless steel I don't have to worry about them breaking and the ice pops out easily. I can also adjust the height so that the bowls don't get dirty! If the bowl is empty then i use a funnel to fill it from the outside. This system has worked great for me, and a reasonable price with the bowls being very inexpensive! this is what i use to water from outside the pen, my dad taped a fuel nozzle onto my funnel to make it easier all of the frozen disc's from banging out the cups!