For a long road trip (over 100 miles), I put food in a cooler with ice. The last road trip was to the snow near Lake Tahoe. I had enough food and water for at least three days. The food doesn't require warming, and is good enough that I'm not craving the expensive food inside the base lodge at the ski resort. Last trip, my cooler included boiled eggs, mixed nuts, cooked sausages (taste good cold), PB&J sandwiches, granola bars, dark chocolate, bananas, homemade smoothies, soy milk, protein shake, and bottled water. Most of these things would be fine if they got warm for whatever reason.

For a short road trip (less than 100 miles), I'll just pack some granola bars, mixed nuts, bananas, and water. I can leave the granola bars and mixed nuts in the car, but I'll try to take the bananas and water out of the car with me if it's a hot day.