Not DIY, but I swear by Lightnin' Bug Firestarters and REI Storm Proof Matches. The storm-proof matches are like road flares -- you can submerge them and they won't go out. The one trick with the firestarters is to place them convex side *down* on the surface. They're wobbly, but have more surface area to burn. They last 7 minutes, which has always been long enough to dry out whatever I'm lighting enough to start a fire.