In my spares kit, I have a spare electric fuel pump, spare electric water pump, some jumper wires with alligator clips, fuses, crimp connectors, spark plugs, fuel and water hose, hose clamps and a store bought small tool kit.
If my car had a distributor, I would have a spare set of points, rotor, and cap.
I drove my car from Florida to Log in Sturbridge Ma. On the way, I joined up with 6 or 7 Lotuses in Pennsylvania. The new expensive electric fuel pump I had just installed before the trip intermittently failed along the side of the road, much to the chagrin of the 7 car caravan. It would start up after 10 minutes and worked fine. Anyway, I bought a new fuel pump at an auto parts store and installed it, and never had another problem.
So, thinking about what could keep your car running is time and money well spent.