The author works on building a bark-roofed lean-to shelter. (Jim Baird/) This story was originally featured on Field & Stream . Shelter, fire, water, and food are the four pillars of survival—and if you run into trouble, you want to prioritize them in that order too. There is some debate, however, between shelter and fire and which one should come first. For example, if you were to take an accidental...

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