Coke made with corn syrup is a Kosher Product. However during Passover, one is not supposed to consume corn syrup, therefore Coke plants around the country, clean out there machines, have them blessed by a rabbi and make Coke with sugar. These Coke bottles usually have a yellow cap and have a KP on the top. Years ago they used to have pull-off labels but those days are gone.

Point - if you go to a Kosher Market to buy Coke make sure the cap has a KP imprinted on the top, otherwise it's just Coke.

Totally off the topic, but if you want great semi-sweet chocolate chips for dipping fruit, use Kosher for Passover chocolate morsels - again made with sugar and no corn syrup.