whistle
silvered mylar (birthday balloon) glued to playing card for signal mirror (suggest they purchase a lensatic compass with real mirror on their own dime or real starflash type signal mirror
tincture of iodine for cuts/water purification
shoe polish/tuna can with concentric strip of cardboard poured full of paraffin for emergency cooking (not necessarily a PSK)
bandana
GI poncho for rain gear on their own dime
determine appropriate size food can to make a nested cook pot for their water bottle
contractor clean up 2mil or greater trash bags
grease pencil to write on slick surfaces
couple of feet of duct tape
braded nylon cordage (pull rope size)

when they earn the right to carry and make fire, consider a SAK and activator protected Bic on a section of cord to be looped around their belt...Bic attached with a couple feet of duct tape carried in front pocket