Save the firewood for later. Don't use untill you get very cold. Assuming that you can build a shelter of sorts or have a tent then this is your best bet.
http://www.heinnie.com/product.asp?s=wvpiv9703038&strParents=&CAT_ID=0&P_ID=4581

I have used these and its remarkable how much differance a candle can make.

Usual words of caution about ventilation.