I think Byrd_Huntr nailed it pretty well...if he has room for a couple of ClO2 water purification tabs and aspirin tabs that would be a plus

down here water transport is high on my list...if you allow an MRE hot beverage bag or home made vacuum sealer bag to be folded on the outside and retained with a bike innertube (which will slip off easily) and a couple of feet of duct tape around the innertube and not make access that difficult...

a Leatherman Squirt PS4 with scissors and pliers and Fenix E01 would make a good pair of minimal sized accessories