First start out with your cups and sanding sugar. Wet the rim of the up and dip it in sugar. One cup will be red sugar and the other should be blue.
Now you can fill the cup up with ice and Sprite, or any other beverage similar to Sprite. For the blue drink, add in some blue food coloring and for the red drink do red food coloring. Then you can add the straws.
Now all you need to do is use a toothpick or something similar and add the blueberries on for the blue drink, then for the red drink just add in a maraschino cherry.