canned butter,brown sugar,oatmeal,high quality hot chocolate. i would leave out anything salty or that would leave a taste in your mouth.water would be hard to come by and melting snow takes time and fuel. i have done some winter camping and a big pot of oatmeal--the real stuff,not packs--with gobs of butter and brown sugar is a real filler and chock full of calories.this will all keep forever and you will not be tempted to snack on it so you can count on it being there when you really need it.that's your base and i assume you will have other chow along for the ride.a big bar of expensive semi sweet chocolate buried in the oatmeal would be a good "fun food" but i would leave it at that.