Water is kind of assumed – otherwise, that’s #1
1) A ‘general purpose’ fixed blade knife. Not a dedicated chopper, not a dedicated fighting knife. Something just as useful for making a tent peg as slicing veggies for dinner or pulling out a splinter. Cold Steel’s “Canadian Belt Knife” weighs almost nothing, and is the closest to my antique carbon steel “Herter’s” model, which I have carried outdoors for 30+ years.
4) Your favorite multi tool. This is as much of a ‘religious’ argument as firearms choice. Pick the one you like, and pack it. A small, cheap backup multi tool is not a bad idea, either, in the kit, or on your keychain.
5) Cheap-o aluminized Mylar ‘emergency blankets‘ – more than 1.
6) Cordage. 550 cord or bankline do not take up much room (I think I’ll have to do a post on ‘survival bracelet braids and double chain sinnets) and can save your bacon.
7) Coffee (or tea). Pick your favorite instant packs or bags. Handy, even if you aren’t an addict, like me.
8) Gorilla Tape. Needs no explanation
9) More zip-top plastic bags and at least 1 large ‘contractor grade’ plastic trash bag.
10) A metal container (that you can also use as a pot) to stick #1-9 in. I like stainless steel “Flan Molds” (available online or at a local Latino market). Circular, about 2 in deep, 6-7 in diameter, 3 or 4 spring load clamps to hold it reasonably watertight. No handle, so if you cook in it, you need the multi-tool pliers to take it off the fire.