I'm quite independent, and until recently was mostly car-free. Still do quite a bit of bike commuting. So, there have been moments of improvised repairs.
A couple of years ago, I blew the bead off of about 6" of tire/sidewall, at around mile 70 of a 150 mile ride.
I had a rag to stuff into the tire for a boot, and electrical tape. Then the next 20 miles to the nearest bike shop, I scanned the road shoulders for whatever looked like it would help.
At some point, I removed the rear brake pads and wrapped the string I had found around the tire.
I also wrapped the left chainstay with electrical tape to protect from rub. There was mighty low clearance on the bike.