It depends on where I am or what I'm doing.

For example:

In the winter around here, something that can start a fire would be my #1 priority. I could freeze to death by the time I got a fire started with just a knife.

But, in the desert, on the other hand, probably water would be #1. I wouldn't make it too far without that.


With that in mind, picking just one for every situation would be tough.