I am in a similar circumstance. Don't count on the garage in a house, I put all kinds of stuff in the garage and the extremes in temperature ruined much of it. I didn't realize so many things could go bad, including commercial flour!
Anyway, some counsel that I received that made sense to me was to first focus on a 72 hour kit and a three month's supply. Have enough items to sustain your family in a catastrophe for 72 hours, then focus on enough for three months. I think the Lord knows you are trying and will bless you for those efforts. The other way to think of it is, should you be unemployed or otherwise in need of it, at least you have enough to get started on making other arrangements, you aren't starting at ground zero
Just my two cents
)