We were going to do the same thing on a car we bought, about an hour into the drive the rear caliper stuck. So we ended up at a casino, no we don't gamble or drink hardly at all just had a nice buffet. We rested up then rented a uhaul and trailered it home next day, had a fun trip.
Here is a list started elsewhere, it just keeps growing. Getting a little ridiculous. Gotta admit AAA, phone and water would do it.
AAA card, cell phone and phone charger.
Small Basic tool kit, sockets, screw drivers, vise grips, gloves, duct tape, flashlight.
Tire plug kit
Small 12V air compressor
Fix a flat
Ignition control box ecu
For SB water pump bypass hose
Cooler/water for yourself and car if needed
Radiator stop leak
Depending on season and local a blanket/thermal blanket.
Ratchet straps/tie downs....
Fan and PS belt
DEI Quick fix tape
Traffic reflector safety light