I saw this on another forum and dont recall seeing one like it here so I though I would start a thread on it. Post up places that sell dry food for cheap, ideas for storage, etc. If you do only $10-$20 every paycheck it wont take long before you have a nice storage.
Here are a few sites I have come across that can help with planning, etc.
Here's a calendar to help you get prepared over a 24 week period. There are many variations of it but the point is to help you buy the things you need and make the other preparations you should make a little at a time so it is not too burdensome financially or otherwise.
http://www.napo-sfba.org/DisasterPreparednessCalendar.pdf
Food Shelf-Life Guide:
StillTasty: Your Ultimate Shelf Life Guide - Save Money, Eat Better, Help The Environment
ETA: If you're staying on a budget, shopping deals, sales, and using coupons is mandatory. Here in the SE, there is an awesome site that acts as a pre-mission briefing on hitting the grocery stores like an apocalyptic commando:
Southern Savers
I know a lot of people know to try Costco, Sams Club, etc, but another good place to shop is Aldis.
ALDI - store locator
The best deal on Rice is at COSTCO, where a 50 lb bag will set you bag a measly $15.00. I've been buying those when I get a chance, and stuffing them in Paint Buckets. At WAL*MART, the 5 gallon plastic paint buckets are approximately $4.00, and can hold roughly 30-35 lbs of rice. The best lids for these buckets are available at Home Depot, as the HD lids have rubber o-rings. If you go to the paint department at WAL*MART, the white 5-gallon buckets ARE food-grade, they're just not marketed as such.