For in car/truck snacks, we usually pack a small cooler and will throw fruit or celery sticks. Rest stop purchases usually result in beef jerky or chicharrones (pork rinds). On occasion, M&Ms plain or peanut for the sweet desire. Oh and a couple bottles of water too. I am down to drinking just one 7 oz Pepsi a day, so I save that for the meal (usually pack that in cooler too).