I am with Harbinger on this, after having a lot of experience with using my bugout bag as my lunchbox on fairly isolated job sites. I call it "isolated" if it is not within walking distance or a very short drive of a fast food joint.

If I am looking at nutritional needs for a combat operation, then cooking is out of the question and reserved only for established locations. Even with my time in the military, I have tuff bin containers full of leftover MRE heaters to attest to that reality. If it takes you more than ten minutes to chow down on an MRE, you are being slow and lazy.

Now that sort of fast food is costly, has to often be prepared or bought ahead of time and may not have the longest shelf life, but that's what you need for combat. Now in OIF, some Marine planners got stupid with this phrase "bullets and water when going out for death ad slaughter", but it takes more than water. Nutritional supplements, protein shakes, food bars, and yes, stimulant substances. I am not talking meth here, but caffeine pills, maybe ephedra if you can get it, 6 hour energy drinks, definitely. That's where the Marines were getting fucked over, there was talk of HSLD go-food, and what they got was just a short issue of MRE and orders to "make it last".

As for meals on wheels, I am looking at militia groups being supported by somewhat mobile communities anyway, and in that, just like where we get these conspiracy theories of Chinese Restaraunts actually being chow halls for platoon sized units in some invasion scenario, food vending trailers can be set up as chow points for our people, with economic sustainability for the preparation. Think about it, your non-combatant support people running a nice little hot dog or stir-fry stand at local carnivals, flea markets and fairs. It already is a mobile kitchen facility, economically self supporting as long as you want to keep it running (they rarely lose money, just that people quit doing it due to making less than they could make elsewhere). It would not be hard to support some teams with regular take-out delivery food.