Organic vegetables and grains are best, but do what you can. Most vegetables are priced cheaper than any meat you're going to buy anyway and you can usually eat as many vegetables as you want. If organic is within a few dimes of the price I would normally buy it, if not, I just get them from the produce stand and do a 15 minute soak.
Get your nuts raw and unsalted. Have variety so you won't get bored.
Plain low-fat and organic is the best option when choosing yogurt. Sweeten with honey, agave, fruit or jelly. Add nuts or granola for a meal replacement.
You don't have to shoot for eating them everyday yet, just add them in there somewhere.
Which of these foods could you add to your grocery list this week?