A cheap alternative is instant rice(Liptons black bean and rice is my favorite) and powdered mashed potatos sold at grocery stores.The packages are sealed and have a decent shelf life(not as long as freeze dried foods or MRE's)but they only cost $1,can feed three,and only require boiling water.
Don't forget about the venerable can of "Spam"......
Me and a buddy of mine were wheeling in my jeep and got hungry so I broke into my food stash that I keep in my jeep at all times.Broke out the can opener and 5 minuets later we had a hot meal of baked beans with spam.The down side is Canned foods are heavy but they keep for years.
Since you asked how to make a homemade MRE
Check this out:
http://www.natureskills.com/pemmican_recipe.html
The tried and true native American MRE!!!