Assuming there is food to hunt/fish:
* knife
* flint
* first aid stuff
ahh screw it, I'll bring a laptop with a satellite modem and make it a vacation
---added this later---
I didn't realize it was just 1 item. I'll stick with the knife... maybe this one
--- and this later ---
Bible? Sounds good, as long as it's hollowed out and contains the three items I mentioned above :-D