I've long been interested in wilderness survival. I learned about different environments, with particular emphasis on what low-tech cultures had done, or were doing, to live there. There is a basic level of comfort and security without which your survival may be in doubt.
I astonished myself by boiling it down to a sentence: "Come in and have a cup of tea."
If you can say that you have the following:
- shelter from the environment--appropriate to the area
- controlled use of fire
- a vessel for boiling water, possibly improvised
- cups, ditto
- something to use for tea, likely meaning at least a basic knowledge of plants in the area
In other words you have a pretty good handle on a set of common threats to your survival--exposure, dehydration and bad water among them. (Boiling water is a fine way to disinfect it.)
It may be that you have brought with you what you need. Perhaps you need to find or improvise some or all of the above requisites. Anyhow, I think the first priority when settling in should be--tea!
So, remember this survival sentence: "Come in and have a cup of tea."