Wetfire Fire Starting Tinder - Pack of 8
It's not Greek fire, but it's close! This tinder will burn even if it's wet, and even if the ground's wet! Just get some sparks going with a flint or a firestarter, then add dry leaves, twigs, or small kindling to the flame to get a toasty fire going.
If the whole WetFire cube isn't used up on your trip, put it back in a ziploc bag and use it next time, within 3 months.