Never skip lunch - Its the law! 2 - 10's (10 and 2) and a 1/2 hour at noon!
As for what I eat, most often the nearest sandwich shop. Or if on the road, I'm usually not far from the only CheeseSteak joint in town. (Well its not the only one, but one of few I'll go to. Being from the east coast (Boston area), I'm kind of particular about it. I'm not fond of gringo burritos "wraps", chinese ones either, I prefer my burritos to made in a mexican owned establishment.)
On the rare occasion I get sent out of the city (where it could be a 1/2 hour drive to lunch), I have a can of chili and a blow touch in the truck for emergencies. Put on some gloves, open can, apply heat and stir with the spoon that is kept in the file drawer.
I am also an sent to work with my daily dose of 64oz's of coffee.
On very rare occasion, the wife will pack me something.