Little known to most survivalists - a lot of bulk food purchases get wasted for the wrong reasons.
This is why Vault-OS is going to fulfill a specific need of preppers most of them don't even know that they have right now.
If you miss rotation dates, don't buy on demand according to what you have in stock (inventory) and do not gauge your purchases according to your deficits (logistics) you are going to end up with too much of what you don't eat, too little of what you desperately need and nothing that is mandatory. It is a terrible thing to discover you have 10,000 expired potato & leek soup packets you will never eat and no protein after one month of cutting into your stocks.
Vault-OS had a screen working previously that was never displayed on this blog because I was still working on it. There was a summary barchart that would show you how equipped you were to feed yourself for 1-5 years at a glance. You could type in the number of members of your family/crew, their ages and genders and get a summary estimate of the differences between what you needed to have in stock to survive a year and the requisite gap you needed to acquire to make up the difference. I had this for several categories of supplies and nutritional support. I borrowed heavily from many ideas crucial to this site.
Going to get this running again as soon as I can, just involves some minor porting to Lua and JQuery for most of it.