No Chametz
Foods that rise during the baking process are prohibited, too. If you have bread in the house, it must be removed before Passover begins. People who strictly follow the rules don’t eat chametz at all during this holiday. Coca-Cola was aware of that and chose to create its kosher for Passover version.
Other Restrictions
Kitniyot is also not allowed during Passover, but all Jews don’t follow it. If someone doesn’t have Eastern European roots, they’re safe. However, that accounts for just a quarter of the Jews in the world. Therefore, people should refrain from eating kitniyot. What is it, though?