A small water tank that you can put on a bicycle. uses a tiny/small metal tank.
A small portable water filter that uses a rag, 1 or 2 charcoal, a plastic bottle and has 20 charges. once it’s been used up, it must be dissasembled. you get your bottle and rag back. You would use this item to purify water wherever you are without batteries and water purifier or a fire and a pot.
If you leave a glass jar full of water out in the sun for a couple days, the water becomes purified through the UV method.
some kind of craftable archery target requiring 4 two-by-fours or heavy sticks, a long rope and either a marker of some kind or a spray paint. It would have a finite amount of health and can only take so many hits before it’s totally destroyed. 2000 hits from darts/pebbles, 500 hits from arrows/bolts, etc. it would require the construction skill to make.
Incendiary/acid/explosive/smoke bombs sealed inside glass vials/spheres. you would make these when other resources are scarce.
Spray can bomb. requires a lighter, a spray can… maybe other materials.
that’s all for now