In the winter, food is not luxury - it is a survival necessity. Fast and slow carbs and fat will boost your metabolism, and you need that boost to fight off cold. Go hungry = go cold. And - those every day dietary considerations go out the window... Your diet now is looking for a mixture of fast (sugary) and slow (such as oatmeal) carbohydrates. And fat. And water - plenty of water. Warm drinks are best, but any water is better than no water.


+1 on anything hot and liquid. You have means to heat water / melt snow, so use it. Oh, and if you can find liquid water, use it - it takes A LOT of energy and time to melt snow.

A snickers bar is a winner. Anything instant (add warm water, let it sit for a while) is a superb winner. You have chocolate drinks, soup, dried food that you add warm water to, ... If you can make it without letting it stir on the stove it is a great plus. (Believe me, heating water for cocoa in the same pot that you just used to make tomato soup is not very appealing. And cleaning tomato soup out of that pot in the winter with your bare hands is not particular fun...).


If ever stuck, the heat of the engine is also of use for a limited time. With the appropriate container, you could melt snow and heat water or food under the hood for maybe the first 10 minutes after stopping. I've heated frozen apple pie under the hood while snowmobiling... the next stop 10 minutes later with coffee, cacao and warm apple pie was really something to remember. Use that heat while you have it....