Those guys are supposed to give a good show. Do not confuse that with showing what to do. Unfortunately each season has to be more spectacular than the one before. So expect the techniques to get less useful.
I haven't seen the show but I can guarantee that they haven't shown their viewers one of the most important survival skills around out in the wilderness - how to use a map and compass.
Apart from that it does not seem feasible at all.
Plus the fact that 3M Steri-strips, Celox, Commercial FAKs, etc.. are somewhat easier to find and purchase than black powder.
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