He should have had a few handfuls of these with him. Cheap, lightweight, and long-lasting. Could be a lifesaver. You only need a little warmth inside your boots or mittens or whatever to prevent frostbite—if extremities get too cold, the body constricts blood supply to conserve heat in the body core, even if it kills your fingers and toes.
To Build a Fire
http://www.jacklondons.net/buildafire.ht…