Small sticks
Tree barks
Knife
Spindle
Flake
Carve a stick in half to create a hearth board
Use a stone flake to create a divot in the hearth board
Create a notch aiming for the center of the divot
Place small piece of wood under the notch
Place spindle above the divot and start rotating the
spindle
Once you get enough coal, take the small piece of wood and
transfer the coal on the bundle of tree barks
Place sticks going from small to big ontop of the bundle
to transfer energy