I tend to snack on the road and try to eat a healthy hot meal once a day..
I pack Almonds, Rice Cakes, Pretzels, Granola, if I want to pack an ice pack I'll take Okios Greek Yogurt, sting cheese, a recent favorite of mine is fake crab meat lol
Oh and Apples
Drink lots of water, I stopped drinking soda altogether a hard task when they are so available, I take crystal light packets to add to the water if I want flavor.