Yep, anything that is FREE when you are living in the woods greatly helps out and is appreciated big time, especially when you are talking months rather than just days.
batteries, white gas, propane, food, gasoline, all can get kinda exspensive in the long run.
All there for us to use - wood, water, earth, game, and what not. Definately helps to keep the expense down when you can be resourceful with what you have around you.