I have gotten tomato powder and dehydrated onion pieces and mushrooms from Packit Gourmet before our last two trips.  They are easy to carry, weigh almost nothing, and combined with a few Italian spices and a little boiling hot water make a very good marinara sauce in just about 2 minutes.  I take Angel Hair pasta, which cooks up very quickly, or the cheese-filled dry tortellini.

We don't mind an occasional vegetarian meal, but I suppose if we had to have meat, could add some pepperoni pieces.

Have never invested in a dehydrator, and at this time in my life probably won't.  Don't have that many more trips in me, and we really don't mind a few packages of commercial freeze-dried food.   ;)