Well, I took a lot of the suggestions here, went to the store and bought about $30 worth of pre-prepared kids meals. Here's my report:
Kid Cuisine ($2.79) - while the packaging was attractive to the kids, the meal wasn't. In the chicken nugget meals (two types of kid cuisine were tried), the fussy eater tried the mac&cheese and didn't like it (he's used to Kraft-brand yellow cheese, small macaroni), the pudding wasn't completed, and he refused to eat the corn. The nuggets were eaten, but only after some serious prodding. The package requires a freezer for storage, but probably would be ok in the fridge for a day or so. The plastic cover was sort of difficult to tear as instructed. Requires a microwave to prepare. D+ for expense, need for freezing, difficult preparation (for a hotel room setting), poor acceptance by fussy eater.
Hormel Mac&Cheese ($1.09) - requires no refrigeration. Requires a microwave to prepare. Preparation was simple. However, the fussy eater didn't like it at all. D+ for poor acceptance by fussy eater.
Lunchables - Pizza ($1.79) - Makes 3 small cheese pizzas Stores in the fridge, not the freezer. requires a microwave to prepare. Mildly difficult to prepare. Fussy eater actually finished 1/2 of a 3" diameter pizza before declaring that he didn't like it. C+
Spaghettios ($0.79) - Feeds at least two kids. No refrigeration required, but need a microwavable bowl and a can opener. Easy prep. Fussy eater ate 3 spoonfuls before declaring that he didn't like it. However his brother discovered that he liked spaghettios. C+
Lunchables Chicken Mega Pack ($3.49) - A neat all-inclusive box lunch. Contains 4 chicken nuggets, dipping sauce, bottled water, koolaid mix for the water, cheese nips crackers and air-heads candy. Package is stored in the fridge, not the freezer, and is ready-to-eat, but heating the chicken nuggets is optional. Fussy eater liked the koolaid, ate the chicken with some podding, but didn't want the candy or the crackers (but his brothers did). The cost is the drawback here. B-.
Easy Mac ($0.79). Requires no fridge. Can be made without microwave - could use coffee maker to heat water. Easy to prep - comes in its own bowl. makes one small serving. Makes the small macaroni, yellow cheese Kraft mac and cheese that he's used to. HE ATE IT WITHOUT COMPLAINT!! A+ for low cost, ease of prep and storage, and acceptability by the world's fussiest eater.
I can augment the Easy Mac with fruit (grapes and bananas) and a glass of milk. Still need some protein though...