Water is as critical in winter camping as it is in summer. If you can find a safe source of water, great. If not, you'll have to melt your water supply. When melting snow for water, ice or crust is denser and much less trouble than loose snow. You wouldn't believe the amount of powder snow it takes to make a quart of water.
Liquids are important in winter camping.
Cold, dry air dehydrates the body quickly, and liquids are important in regulating your metabolism. Very often, if you feel cold, a drink of even cold water will quickly warm things up. Try to allow yourself some time to wander after camp is set. Enjoy the views and the tracks of deer wandering to feed on birch shoots, snowshoe hares, bobcats, fishers, grouse, foxes, and the ubiquitous red squirrels and mice. The only thing you generally won't see is other human beings.