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Tim Kennedy listed the following as essential:
IFAC
Glock 43 or 19 depending on the location
2 extra magazines
External battery charger
Water
Snacks
Life straw
Flashlight
Ghost strike fixed blade knife
Extra cash
Good ballpoint pen
Chapstick
5-50 cord
Kevlar string
Handcuff key
Hidden handcuffs key
Handcuff shim
Lock picking kit
Ceramic ball
Cell phone Ref. Source 9x.
This list isn't complete. From experience I would add the following:
Water purification tabs (Life straw only goes so far)
100 mph tape
Blood chit
Flint & steel
Chalk
Note pad
Spotting scope
Poncho
Poncho liner. Edited: Abnninja on 20th Sep, 2017 - 7:07pm