Beef jerky, not the cheap kind, the thick cut moister stuff. Foot powder, soap, wet wipes, candy, magazines (not porn that will end up getting confiscated), cookies preferably the individually wrapped kind, drink mix, like tea lemonade and so on. AA and AAA batteries, hand lotion, good stuff not the cheap dollar store stuff, chapstick / carmex, decent flip flops, maybe a wash cloth and hand towel, sun screen, bug juice (off or other DEET kind)
Other stuff you think they might like when there is no access to regular stores.