I have allot of things...Chrystal light w/electrolytes. Bounty paper towels. (They cost too much there. For many uses...) Ceramic paring knife for fruit. (Won't react and cause the fruit to go bad quickly.) Rechargeable batteries. (You can leave these with friends. They will need them due to power outages.) Thermal water bottle carrier. Cheap travel door alarms. (Never had a problem with break-ins, but doesn't hurt to have just in case.) And of course... Beer bottle cozy.
I have allot of other items I take to different vacation locations, and some I left out.