Deck screws, the 2.5 to 3″ ones. Shelters, repairs, all else fails treat em like a nail and bang em in.
Baling wire. If you can’t fix something with duct tape or baling wire, it truly is broken.
JB Weld. I actually hate the stuff but there’s times that its indespensible. Cracked oilpan? Transmission leak? Radiator leak?
Heat shrink tube. Various sizes for different uses. Small to cover electrical splices, larger for hoe/shovel covers or repair. I once put a rifle stock back together in the field with some epoxy, a couple deck screws and some shrink tube.
Electrical tape. Aside from the obvious, muzzle covers, bandages, all the stuff you don’t need duct tape for.