Look on the costco website - they have packages online of like a year's worth of freeze dried meals for an entire family, for quite a chunk of change - but it would have variety and shelf life.

Plan Yosemite and Sequoia/Kings Canyon for the very last part of your trip. That way you will be able to fit your food into bear lockers. Which you will need to do in Yosemite if you plan to still have a functional car after staying there.
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