This one is very easy. Steep a bag of blueberry tea into a cup of boiled water for 5-10 minutes, until strong. Then stir in a teaspoon or two of blueberry fruit spread or blueberry preserves. Natural is best (sweetened with fruit juice or fruit syrup).
You can do this with other fruit-flavored herbal teas and other fruit spreads, too–such as strawberry, cherry and apple, depending on what you can find. I like to sweeten apple or cinnamon tea with apple juice. It’s nice.