Let's have some fun.

You are stranded in a forest under the worst possible conditions for several weeks. The weather is unpredictable, from hot during the day, to cold at night, with precipitation off and on without warning. Your canoe has overturned in the river leaving you with no real provisions except for one sharp tool.

If you were able to pick the tool you had, what would you pick and why? Feel free to add any other suggestions with a picture.