I don't know how Arizona is with fire ants, but when I was in Texas, my priority list looked like this, in order.

1. Stay away from fire ants
2. water
3. food
4. shelter

I didn't know about tarps then, so all I used was tents or hammock. <img src="/forums/images/graemlins/grin.gif" alt="" />
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I've taken a vow of poverty. To annoy me, send money.