You could make the peanutbutter protein bars from the book. Wrap one up and bring it with you.
I went through a stage where the idea of a shake was unpleasant, so I started making a protein "cookie"--the recipe for which I found in this
thread:
1/4 cup oatmeal
1 scoop chocolate protein
2 tablespoons peanut butter
water to mix it all up
The original recipe called for some kind of sweetner, but I leave that out. It's not needed.
It tastes a lot like those no-bake cookies and doesn't spoil, rot, or go bad