Canning has been mentioned before, but I thought I would set out a recipe guideline here. The kind of canning I am proposing is not the tin can type, but more the pickling-in-glass-jars type. It is a low-tech, low-sodium method of preserving just about anything.
Skill used:
-cooking (obviously … recommended level 2, canning is not difficult, but it is more demanding than burning toast)
-mechanics( level 2 … for figuring out how to get the sheet metal correct for a good seal)
Tools:
-pot or stone pot (frying pan not really deep enough in my opinion, but my opinion is not crucial)
-nearby fire (and all the usual substitutionary suspects … hotplate, integrated toolset, etc…)
-rock OR lump of metal OR … (really just a weight to aid the sheet metal lid seal during the cooling process)
Consumed in the process:
-item to be canned: meat OR marrow OR fruit(apple, blueberry, strawberry) x1 (or however many portions are envisioned to fit)
-glass bottle x1
-sheet metal (for the lid and seal)
-water x1 (clean OR not) (you boil the glass bottles and food in it, water lost to canning process and boiling evaporation)
When eaten, gives:
-nutrition to the player (and perhaps some hydration)
-glass bottle (optionally the bottle could contain 1 charge of clean water…)
This would probably result in needing to add three items to the game: pickled meat, pickled veg marrow, and pickled fruit, each with their own nutrition value.
As availability of salt or salt water is the rarity control for jerky, so the sheet metal ingredient is intended to moderate pickling factories.