I recently went on a road trip for a few days and had to find a way stay on track with my food consumption. As you probably know, there are so many temptations and pitfalls when traveling by car. For instance:
--Fast food everywhere. Any possible food item you could want, right next to the Interstate highway. This is incredibly tempting.
--Convenience stores/gas stations. Again, surrounded by junk food.
How I dealt with it:
--Grocery stores became my "restaurant." I would stop in, load up my cooler with various food items. This gave me plenty of food for the road, but also serviced my desire to stop and get something.
--Had dinner with great friends who made a very healthy meal.
--I allowed myself to eat. I wasn't writing anything down on the trip...I just ate whenever I felt like I needed food.
All in all, preparation is key. Like everything, it's a lot of work to eat right and much easier and cheaper to eat junk food.