For me it's all on the planned bug out. I have "levels" of bug out. My level 1 is grab a bag and go, worst case scenario and I we each have 7 days of food (generally MRE's) in our pack. With rationing that could last a bit longer. My level 4 (total bug out or even bug in) is a years worth, where I move towards the bulk flour and grains and less about MRE's (but they are still part of it). I try to figure my different plans based on if I'm trying to actually get out of town or not because there is only so much you can carry in even a large SUV.
I'm generally planning on a large scale level 4 bug out and go as far as keeping some things buried in areas that I can get to easily if I cannot fit it in my car or if have to be on foot and cannot carry more than a very small supply of food with me. When you take into account the rest of what you need (like fire making, first aid, water purification, comfort, shelter, weapons and ammo) it can be quite a chore to get everything to the right ratio.
I've spent years putting together my plans and test them constantly. I often camp with my bug out gear so I can get a feel for what is not really needed or useful, what can serve a dual purpose and what I'm missing and then I scale that up for the other levels of bug out.
There are great ideas here like for how much flour is needed for so much bread. I take that concept and start at the top and say "we need X number of calories per day, put that into meals, break the meal into components, multiply by intended days" and so forth until I get the food requirements figured out. One I have that then I try to find ways of making that efficient and interesting (nobody wants to eat the same meal every day for a year but I would if I had to) and how I could fit that into my SUV.
It might just be me, but I've got some serious issues.