This post on final survival prep from Neithercorp Press has lots of good information for getting ready NOW before anything happens. Not just good information in the blog posts, but lots of good tips and ideas in the comments too.
Beans, rice, peanut butter, flour, vitamin/mineral tablets, and dry milk are all recommended to stock up on for your food stores. They keep well, fairly nutritious, and not very expensive. Buy one or two extra bags of rice or beans each grocery trip and soon you’ll have a nice stock saved up for Emergencies.
Also learn what edible plants and weeds grow in your area. If you don’t have time to stock up enough food stores, a few good books on identifying edibles will be a life saver!