OK so in real life it is possible to make a fuel a primitive kerosene/oil for storm lanterns from birch bark you pack a steel can with a lid (like a coffee can) full of birch bark and punch a nail hole in the bottom of that can so the produced oil can drain into another can once heated in a fire.
maybe I would suggest 10 birch bark and 2 recycled cans (reusable) for 500ml as it's a game and have the appearance of the cans be within the fire stacked on top each other?
https://youtu.be/XOidkCPgP24
Not sure if links are allowed but there's the real life example.
We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.