No Chametz
Any food which rises during cooking is prohibited as well. If, for example, there is a loaf of bread in the house, the occupants need to clear away the traces of it before Passover. And that means every last crumb. Folks who strictly observe the rules of Passover literally do not touch anything chametz during the holiday. Coca-Cola must have known about this, so they decided to make a kosher version of Coke.
Other Restrictions
Aside from chametz, kitniyot is also forbidden during Passover, though not all Jewish people have to observe kitniyot. If a person doesn’t have “Ashkenazi” (which means Eastern European) ties, then they are in the clear. However, that just covers around 25% of Jews in the world. That means there are still a lot of people who avoid kitniyot during Passover. But what exactly is kitniyot and does it mean anything for Coca-Cola?