Frozen organic berries -- blueberries, blackberries and strawberries -- can be expensive during the fall and winter months. During the summer, when berries are at their peak and most affordable, stock up on the fresh supply and freeze them yourself. Simply remove stems and leaves and rinse the organic berries; let them air-dry on a towel, and place them on a parchment-lined cookie sheet. Freeze them and transfer the berries to airtight plastic containers. Come fall, when you're in the mood for a summer smoothie, you'll be stocked and ready to go.