Good for you, for staring temptation down!! It gets much easier as you go along in the program.
Like Robin suggested, always have some food with you. Today, I ran errands all afternoon and took two Ready to Drink shakes with me. Sometimes, when it is close to the next meal, I take along a bar(some of them don't hold up too well in a boiling hot car)!
Again, Congrats for getting over your first 'speed bump'!!!
Joan