Topic suggested by Delta7:
Is this the type of thing you had in mind?
The family was on a vacation trip in an RV out north of Hobbs, NM about 20 years ago. Basically high desert and it was a Sunday in July, temperature over 100 degrees. We saw a car parked on the side of the road with the hood up about 50 miles from the nearest town. We stopped; it was an older man and his wife. He was trying to get her to town for a dialysis appointment first thing the next day and the car was overheating. We put her in the RV (roof air conditioners are a wonderful thing) and gave her cold water while he and I checked the car. We discovered he had a split radiator hose and no spares.
I pulled out my electrical tool kit (yep, I vacation with one in the RV) and the duct tape. I started by wrapping the hose with duct tape. Knowing that wouldn't hold the pressure, I then wrapped the hose from about an inch outside the split on one side to an inch past the split on the other with 22 gauge hookup wire. I used the electricians tape to hold the wire in position. I then took the duct tape and put another wrapping of tape around the hose. We gave him some of our spare radiator fluid and a six pack of cold water bottles for he and his lady. He started the car, the a/c worked and the patch held. We followed them the 50 miles to town and his hotel. For us, no big deal. For he and his wife, TSHTF big time. In that heat the odds are very good they wouldn't have made it had we not stopped.
That electrical kit came in handy several times that trip but those are other stories. The moral is, do what you can with what you have, of course, but also be willing to think outside the box when it comes to using your preps.