Find a stick the diameter of a pencil. Even if that stick is wet (but not completely saturated). Remove the small first-grade style school pencil sharpener from your kit and sharpen away. Use the shavings for tinder (once you've sharpened past the wet outer part of the wood). Same principle as shaving a stick down to its dry inner parts with your pocket knife, but it's easier to end up with very thin and consistant shavings using a pencil sharpener.