Jerky, especially bacon jerky, because bacon. Grab the mango habanero beef types if you are okay with spice.
Nuts of your preference. I love smoked almonds or just plain macadamias. Chili lime peanuts are okay if you're going cheap.
Candy to replenish energy. Chocolates are okay if you have enough water to alleviate the coming thirst and if they won't melt.
Chips of your preference. I like Calbee seaweed potato chips and mixed root chips because of texture.