The healthier eating and drinking habits during road trips help avoid feeling tired, bloated, or jittery. With a bit of planning, travelers can pack nutritious snacks that provide protein, fiber, and healthy carbohydrates instead of relying on convenience foods. Recommended snacks include nuts, whole fruits, dried fruit, whole-grain crackers, popcorn, and peanut butter, as well as cooler-friendly items like sliced produce, hummus, yogurt, and cheese. Pre-portioning snacks and keeping food properly chilled helps with convenience and safety. Staying hydrated with water is emphasized, while limiting coffee and sugary or caffeinated drinks can improve energy levels and sleep. Unsweetened flavored water or iced tea is suggested as a refreshing alternative.
Source: https://www.eatright.org/food/planning/away-from-home/smart-snacks-for-your-trip