Lose a lighter in the grass?
Run a lawnmower over it and you will find it soon enough! eek

Haywire is nice stuff to have around. It can let you fix broken things enough to get you home and even makes an effective hose clamp.
Candles are wax and wax is a fairly good lubricant for things that slide, like zippers.

Bicycle inner tubes are stretchy and strong enough for lashing a lot of things together.

Epoxy or polyester resin makes good patches on boats. Even if you only have rags to soak in it instead of glass mat. Cloth is not as strong as glass fibre but it might be enough to get you home.

Three 12 volt car batteries connected together with booster cables give enough volts and amps for a small welding job.

A carpenter's claw hammer is an astoundingly versatile tool.
It wil drive nails and pull nails. It will also cut wire, peen rivets, break glass and crack nuts.
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May set off to explore without any sense of direction or how to return.