For the 4 month, 7 month, and 18 month packages.... 1. The 4 month package states that this is for one person, is that true also for the 7 and 18 month packs? 2. What items in these packages have the lowest shelf life? Or perhaps more simply what is the minimum shelflife for the overall package? 3. What is the estimated storage space required for each package, in ft or cubic ft if possible? (length x width x hieght) Thanks!