Do you have ammo for your pistol?
After your map dries, tear it up more, put it in a small pile, find dry wood, and make a pile out of that, then place the pile which was previously your map on top of your pile of wood. If you have a clip for your pistol, take a bullet, find a very thin stick and try to break the primer on the cartridge. Put the gunpowder on the pile that was previously your map, load your pistol with a new cartridge, and shoot the pile of your map, aiming for the gunpowder. This should cause a small flame or slight smoking, at which point, you should blow continuously on the point at which the smoke/flame is emmiting from, until an actual larger flame starts, at which point, you should back away to avoid all risk of being burnt, and watch as a fire starts going.