Just start with water, warmth, sustenance, shelter, and security and the tools/supplies to augment these in the field and you’re good for 72 hours. For tools, I focus on cutting, chopping and pounding tools. A little 22 automatic. And a shotgun.

If you have the luxury of time, have anything for comfort or longer outings ready to throw in.

You’ll never have everything you need. But you can survive for X hours.

I have found that intermittent fasting is a good skill to keep in your back pocket. That way you won’t turn into a retard if you don’t get three squares for a while. You won’t even miss a beat if you have to just make distance for the first day.