Dave: I was more referring to building a fire, especially the tinder ball, using natural materials and not relying on commercial firestarters as tinder. I'd be more worried about soaking my Tinderquiks than losing my flint/steel combo. In Minnesota, we have pine sap, pine needles (dried) and paper birch bark, among others, as excellent natural fire-starting materials.
As for all-natural fire building, I have read through Tom Brown's survival text many times and conceptually understand how to do a bow-drill. I have never really sat down and worked at it. Perhaps it is something I should take a weekend (or two, three or more) to work at.
Nice video: one thing that is not explained is how to make the various pieces.