L.N.
schedule errands between meals. if kids get hungry have a banana handy for them but don't feed food (lunch, breakfast etc) in the car. it's not healthy and it's dangerous.
lunch ideas for NOT in the car:
PB and J with milk or water followed by some kind of fruit
cold cuts sandwiches
boiled egg, bread, fruit, cheese etc.
but please don't make it a habit to feed kids junk food or any kind of food while running errands.