You just get the idea you need to be in the wilderness (whatever is local - hot, cold, dry, wet, etc). You can pick anything up you want on the way out, but you can’t stop walking out the door.
How long do you reckon you would make it living off the land? Any special circumstances or tools that would have helped?
Not to mention the earth is a huge heat sink, sleeping on the ground without insulation will make you very cold very quickly.
That’s why you sleep on your shins and forearms in an upright fetal position. Maximizes skin-to-skin contact for your full body, and minimizes heat transfer to the ground.