Backpacking!

[Alex]

How much ground are you planning to cover in the hiking?

Is it something like hike in 7 miles, camp in the same spot for two nights then hike back out or more like a 10 mile per day grand loop tour of some area?

That would effect how much you might want to compromise on the fresh food thing. But one thing I would recommend even if you want to avoid heavily processed food is a trip somewhere with a good dry bulk selection (like Whole Foods). Consider dishes that you can premix all of the dry ingredients then just cook in water. I've done a lot of good pasta and stew dishes where I put all of the dried ingredients and seasoning in Ziploc bags at home then just add water for cooking.