My brother and I recently completed a ninety mile backpacking trip on the Long Trail/Appalachian Trail in Vermont. As part of the provisions we carried with us we both made food bars from scratch. They were easy to make, easy to carry, and had twice the food value of common commercially available products at a comparable cost.
Step 1: Ingredients:
Crunchy peanut butter (1/2 cup)
Caramel cubes (1/4 cup, approx. 10 cubes)
Semisweet chocolate chips (1/4 cup)
Sweetened condensed milk (1 cup)
Oatmeal (1/2 cup) (wheat germ may be an even more food-dense alternative)
Protein powder (1.5 cup)
Walnuts, diced (1/2 cup)
Raisins (1/4 cup)
Craisins (1/4 cup)
When purchasing materials in the store, be sure to compare brands to get the product with the highest food value per unit volume. I focused on calorie, carbohydrate, and protein content.