I definitely agree with the canned tuna and nuts idea. Also i like to get a small tuperware dish and throw some natural peanut butter in it...then bag up some celery, or apples on occasion. I have also just bagged up some meat and cheese to take with me...of course this depends on how long you are going to store it. Definitely cook ahead and everything will be fine. Good luck!
BTW... of course those are my legs pitysister. lol