Want to be ready for a natural disaster what and how much should i have?

I am getting my first house and i want to just basically start getting prepared for a natural disaster. I dont mean i am expecting the apocalypse. I was thinking food wise getting some MRE's. What is the shelf life for them? I figured i would get a hand crank radio, alot of water. I was thinking would i be better off just getting some 5 gallon water jugs like the ones you have in offices? or should i go with packs of bottle water? what else should i get? how much water would be enough? Its just me and my wife.