To better understand how to store Jello properly, we have first to explore what makes up a Jello. Jello is typically made up of four essential ingredients—water, gelatin, food coloring, and artificial flavors or sweeteners. (*) Among these ingredients, it's the gelatin (mainly the collagen it contains) that gives the Jello the potential to be molded into a different shape. The collagen is produced by boiling the hides and bones of other animals.