The suberin waxes in birch bark light up even after a rain. Any near-by conifer trees? spruce, pine, junipers? The driest twigs are right close to the main trunk. A handful of those. Next, beat on them with a rock to pulverise them into fiber. The wood resins are flammable too, helps with catching sparks. Then you can cook up one pot of corn chowder. Dice and fry 6 strips of bacon. Reserve the bacon but leave the grease in the pot. Fine dice and fry a big onion. Got any tired old mushrooms in the back of the fridge? dice and toss in. Add 2 cans mushroom soup and 2 cans of milk. Add 2 cans corn kernels and all of the bacon. Simmer for a while. I always figure that it needs salt and especially black pepper.