Plastic water bottle caps are color coded based on the type of water: blue caps indicate "spring water"; black caps signify alkaline water; green caps signal flavored water, and white caps mean ...

The yellow caps indicate that the soda is kosher, or fit, to drink on the Jewish holiday of Passover. It's made with sucrose ...

In addition to the yellow cap, the bottle has a Passover certification symbol. The Hechsher, or the Ⓤ marking on many common food items, is a signifier that the food is certified kosher.