I'm also a fan of freezer bag "cooking." (Actually rehydration, not cooking) Some kind of cozy is necesssary to keep the food warm while it's rehydrating. Can you tell I hate washing dishes, especially pots and pans? laugh This method also saves on fuel. Lots more about it, including lots of recipes using grocery store ingredients, here.

I definitely second getting the pieces you want separately. I've found that "kits" of any kind invariably include unneeded items and omit items I need.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey