Didn't want to hijack the "Ask a Mormon" thread, but I had always understood food storage to be a commandment, so when someone stated that it wasn't, i went looking for quotes. Here's a quick one from providentliving.org. There are others.

"Our Heavenly Father created this beautiful earth, with all its abundance, for our benefit and use. His purpose is to provide for our needs as we walk in faith and obedience. He has lovingly commanded us to ?prepare every needful thing? (see D&C 109:8) so that, should adversity come, we can care for ourselves and our neighbors and support bishops as they care for others.