Great suggestions.  Also, another pair of boots, and a small camp axe, or hatchet, for cutting firewood, fallen trees across the road, for chipping ice, around the vehicles' tires, or for water.  And a small pot to boil water, and tea bags. Also six or eight of those little hotties, hand warmers.  Ooh, just remembered, "Toilet paper"!!  For me I always have fire arm handy.
                                   Wayne