Well, I have quite a variety of roosts, but they have their favorite spots they always sleep on.
I have a automatic watering system with cups, but I turned it off last week so it wouldn't burst with freezing temps coming up. I have heard of people doing this but I'm not sure if its cruel or normal, is it okay to let your chickens eat snow over the winter? I know I will still need water for my ducks and geese.
Does the fertility problem last only while it is frostbit, or is it permanent?
I didn't know either, but I suppose if your nose and ears got severely frostbit it would be horrible.
NO, do not expect your birds to live on water. That is not enough. If you had a stream or creek they drank from in winter for water, that would be okay, but not just snow.
I don't know for sure what the long term effects are on fertility and frostbite.