Critical since you have access to a microwave, what about those lunch-y type meals that are in the little bowls in the prepared (not refrigerated) aisle. I've never paid much attention to what they actually are (), but I think they're like chili, pastas, etc. Do you know what I'm talking about, or do I just sound loony?
Otherwise, what about yogurts (I've never refrigerated those when taking to work...unless it's 100║ outside), combined with small amounts of raisins, nuts, etc.?