At the bottom of a tall glass (or 8-oz glass), add 1 tablespoon of Blue Curacao (or blue simple syrup). 
Add crushed ice, fill almost to the top. 
Add 3 ounces of Orange Juice and three ounces of San Pellegrino TONICA or lemon-lime soda. I personally added a little bit of both of them, but if you want a sweeter taste, go for the lemon-lime soda. If you want to make this into a cocktail, use the TONICA. 
Top with a little more orange juice and give it a stir.