Actually that's what I've been doing most of the day. Each summer we have a garage sale to get rid of stuff that has built up in the garage over the winter (the garage is kind of a dumping ground for unwanted house stuff mostly). After the garage sale we donate what's left to charity then go through and clean pretty much anything that won't get up and walk away from us. This allows us to rotate our water and food stores, reorganize everything that wasn't put back in the right place, and check out the emergency supplies (we are running low on AA batteries, probably because of all of the kids/relatives/friends we have had over during the past six months or so...all of those electronic gadgets seem to take AA batteries).
The garage is our first "go to" place in an emergency. Everything we need from food to water to batteries to toilet paper to stored winter clothing to clean up supplies to candles to tools ad nauseum, is stored in plastic tubs in the garage. It always amazes me when people, even those who live in tornado or hurricane-prone areas, know a disaster is imminent and they still are shown on the news running out to the store for emergency supplies and provisions. By having a well organized, well stocked garage (or attic or shed or closet) you should be able to shop a little each week and build up enough stores to see you and your family through at least the first week or two of a disaster without having to run out to the store.