i just bought some strike anywhere matches (big wooden ones), coated them with clear nail polish sealer, and put them in a waterproof match holder. total cost is around $3.00 for about 250 waterproof matches + nail polish + container. i know they won't re-light if submerged in water but i ran mine under water for about 30 seconds, wiped it off on my shirt, and they still light right up. the positive side is you'll have plenty of tries to light a fire cause they're so cheap to make.

oh, and i put a cotton ball inside the waterproof container to stop the matches from rattling . and, of course, i can use it as tinder if i need to light a fire.