These are a tricky number but can easily be included to make your menu more appealing. On the trip there keep the eggs in the cooler until the last possible moment. After transfer to your bag they will last at least two days in cool weather and not past the next breakfast in hot weather. When you repackage the food for the trip add in the proper amount of powdered milk and adjust the instructions for water accordingly. Thus it is quite impossible to avoid bringing in butter to get delicious food.
Key substitution is margarine which is made from vegetable oils and takes nearly forever to go bad.
The most backpack safe version is the squeezable kind which generally comes in heavy duty plastic bottles. Just be sure to isolate this in a ziplock bag. Soup starter takes forever to rehydrate where the snack veggies take no time at all. Vegetables are the most neglected of the food groups yet provide the most valuable sustenance, replacing valuable vitamins and minerals from physical activity. MEAT One can only stand canned meat for so long before they start going crazy.