Remember, during the winter you have to keep the water from freezing. I use a heated pet bowl, as you can see. As Pete said, don't clean the bedding during the winter, it helps keep them warm. As long as we open the door during the day, there's very little odor. In the summer, we keep the windows open, and the bedding changed, and there's also very little odor then.
One important thing to know. Chickens don't get around well in the snow. Once you get about 6 inches, they have trouble sinking into the snow, so you have to keep them in the henhouse. In does get stinky then, and you will realize how much food they find by free ranging, because they consume about 3 times as much chicken feed. For feed, I use Agway Layer Pellets for the adults. It's chemical free, but not organic. I market my eggs as free range, chemical free, and they sell like hotcakes at the local health food store.
Rich
"What a long strange trip it's been."