We had 3 Red Stars and a fake Australorp (she has feathered feet as an adult, so I don't know if she's a mix or what. Pretty black feathers and a nice disposition. Oh, and she likes to hop up in the window and watch TV!) This year, we have added some RIRs and Black Stars.
We tried using a light bulb in a little brick frame with the water container on top, but that didn't keep it from freezing. Ultimately, we just kept heading out to the yard and knocking out the ice and adding fresh, warm water a few times each day. It helps to put the water in the full sun, so it has the best chance of staying melted. This year, I would be willing to buy a heated waterer. That was too much work.