I assume that in an air ambulance you can count on air rescue within a short period of time. The aircraft would have an ELT that would bring help quickly.

Follow the rule of 3s.

You have live:
3 minutes without air
3 hours without shelter
3 days without water
3 weeks without food
3 months without love.

I think your gear should be about shelter - fire building, multi-tool to construct a shleter, saw to cut branches for insulation, etc.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra