Hello, So I've had chickens about 2 years. I grew up in a place that pretty much never froze and it rarely does here. Well, it's fixing to be a cold, cold winter. I've already had their water freeze over once. I gave them a dish of liquid water and it was cool. However, I'm planning on going on vacation for the holidays. Usually they're pretty self sufficient, have someone check on them every couple days. Not sure what to do if it's freezing though. Are there any electrical devices or additives to the water that will keep it from freezing?