When it comes to matches, waterproof ones are best, especially in dire circumstances like a flood. Since they're much more expensive than their pedestrian cousins, you might want to make your own.
Use the Candle Technique
Burn a candle long enough for a pool of wax to form around the wick. Blow it out, then dip the head of your match into the wet wax, about of an inch (3 mm) up the stick. Remove the matchstick and allow the wax to dry, pinching it closed to form a water-tight seal.
Deploy the Nail Polish Ploy
Coat your matches with clear nail polish to waterproof them. Dip the head of the match and a bit of the matchstick itself into the polish, then rest the match on a counter with the head hanging off the edge to dry. Survive any wilderness situation with these critical tips.
Try the Turpentine Trick
The easiest way to waterproof your matches is simply to drop them in turpentine. Allow the matches to soak for five minutes before placing them on newspaper to dry. After twenty minutes or so, you'll have waterproof matches that will last several months.