A friend (the scoutmaster) and I were once driving two carloads of Boy Scouts on a very rural road when he popped a radiator hose. After walking the shoulder for a while I found a small can (V-8???) that looked to be the right size. Used my P-38 to cut both ends out, and the seriated blade of my Leatherman to cut the hose at the break. Inserted the can into both ends of the hose, slid them close together, used the Leatherman to twist some wire (also found on the shoulder, CA highways are often really littered) on as a clamp, added water from my five gal cooler, and off we went. He said it worked so well, he didn't replace the hose for weeks.

And yes, I had better supplies with me, but they were buried under all of the gear in the bed of my P/U. This turned out to be faster than unloading all of the gear...