It's been mentioned here previously, 100 cal/oz is a good benchmark.
There are food items one can prepare at home. For me, a lot depends on personal preference of how long you can be satisfied/happy with a particular item and how long the trips is expected. I could do MH for a week trading off between 2 or 3 faves. I could do 2-3 days with granola bars, jerky, and water.
