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I'd like to put some sort of meal in the pans and maybe something inside the pots, so any suggestions on how to do that would be appreciated.
A good way to make anything like this is epoxy putty, like Miliput or A+B.
For a pile of bread rolls, you can hollow out a resin cooking container or make up an open C-Rat box and then roll a bunch of small balls of putty and just throw them into the container. When cured, paint 'em bread colour.
Use the exact same technique for a container of apples, oranges or potatoes, except paint 'em apple, orange or potato colour.
For soup, hollow out a resin pot or make one from a cylinder of something with handles, then place a disc about 2/3 of the way up from the bottom. On top of the disc add a few small bits of dust or sand to give the disc some fine texture (I do NOT want to know what is the "texture" in real army soup, thank you!), overcoat with a thick layer Mr. Surfacer 500 to unify everything and then paint "soup" colour when all dry.
For track pads & gravy make an oblong sausage from epoxy putty that is the right size (i.e. too small for my appetite) and then slice it into Salibury steaks. Layer them in a hollowed out rectangle baking pan (making them look semi regular with a space open for those that have already been dished out) and then add a layer of the Mr Surfacer 500 as the "gravy". Let it dry and paint Salibury steak colour.
You can see how this can be expanded to cover a lot of the dishes normally found in a field kitchen. Use your imagination on how they are arranged around the serving opening and all of a sudden, your mouth will be watering with the memories of all that fine chow.
Or, of course ,some other part of you could remember the later effects of all that chow and protest, but, you get the idea and I think we're done here...
Hope it helps.
Paul