Well, I guess it depends how deep your snow gets. In some of the places I've lived, it gets way too deep, like, 3' of snow on the ground all the time and sometimes a lot deeper. I kept mine in a 3-sided shed or a barn because of that.
One thing I did about water: I used small dishes that had sloping sides, so the ice would come out easy. Each morning and each night, I'd give them hot water, as hot as it came out of the tap. I know it sounds weird but they liked it. And think about it, when it's cold, we like hot tea, hot cocoa etc. By doing it twice a day the rabbits had two times a day to get a good drink of liquid water.