Make sure you include a first-aid kit for any cuts, abrasions, or medical problems that may arise. Include pain medication, bandages, and gauze. Antibiotic ointment is also good to include.
Extra water and food should be included since sometimes help doesn't come right away and it could be a long wait in the heat. Stay hydrated and eat some food to keep your energy high.
A few simple things can make a disaster become less of one. Include a roadside emergency kit in your vehicle.