Not quite clear what you are asking.  If by freezer bag meals, you're talking about dehydrated food in Zip-locks, that should be fine - except, who's gonna do all that dehydrating?  If you're talking about Mountain House Freeze Dried meals type of thing, that shoud work really well - get thier money up front, let each person select what they want for that meal and put in an order to REI.  When you get the food, write on each package, Day # --, and that person's name.  That way they can't complain about the choice for dinner (and you don't get stuck with the cost if they bail out at the last minute).  Breakfast should be easy - instant oatmeal will work for most.  Anybody that does not like oatmeal can do thier own thing - maybe cereal and some Milkman.  

Lipton Cup-A-Soup may be old fashioned and hard to find in decent varieties anymore, but it is a great addition to any meal.  Lets the kids eat something hot while the rest of the meal is cooking, and supplements the liquids intake.  Likewise, I bring beef broth boullion, and alternate that with the Cup-A-Soup.

Part of my meal package is some kind of desert.  For a group of kids, instant pudding would work great.  Bring some pre-measured baggies of Milkman or Carnation - Mix in ziplocks by shaking, tie to a string and float in the lake till it sets up.

My experience working for an outfitter is all on river trips, where you don't have to portage, so its all fresh food, cooked on big stoves and 3 or 4 20# propane tanks for fuel, cooking for about 35 people on average, and sometimes up to 50 (and about a 150 on one school outing at a "camp").   If you want some ideas on that let me know.  But we usually do one day's breakfast with the oatmeal anyway.   Trouble with group cooking for a large group, is lots of clean-up, and you have to have big pots to cook in, which would be a pain on a wilderness trip ( and I personally wouldn't want to do real cooking in Griz country - your view may differ).