small hand held LED light using same batteries as the headlamp, probably AAA...I EDC'd a Gerber Tempo for years, and currently Fenix E01 and spare battery
if phones in the area still take coins, a strip of 4 quarters on a piece of tape don't take up much room
small bottle of tincture of iodine, and instruct on how much to use to disinfect water with the metal bottle volume
if allowed instead of a knife, I'll still pitch the use of a pair of electrician scissors like the Wiss 175E
roll of friction or electrical tape
pencil/pen
P38 can opener
needle nose pliers with wire cutting capability