On cold weather trips pack between 3500-4000 calories or roughly 2- 2 1/2 pounds of food and 1/4 a liter of fuel per person per day.
Take a Hot Water Bottle to bed with you (see the recipe for Sierra Ice Tea).
One-dish meals make clean up easer.
A 0.5 liter nalgene bottle fits well in a beer coozie to double as a thermos. This also tuck nicely inside you jacket as a hand warmer.
To melt snow for water, you need to start with a mix of snow and water in your pan so that you don't scorch anything. And be sure to boil water if you are traveling somewhere were you would normally treat your drinking water.
You'll need to make sure to drink lots of fluids, so pack drink mixes (like gatoraid or emergen-c), soup mixes, as well as coffee, tea, and cocoa. Aim for 3-4 liters a day.