The purpose of this invention is to allow users of bottled water to identify which bottle is theirs when two or more people are drinking the same bottled water. The water bottles come with a particular cap that has a 1/8" orifice and is filled with food coloring. The cap is then placed on the water bottle and sealed airtight with a gasket. The cap has a safety seal placed around it and the bottle to avoid mixture prior to usage. The following steps describe how to open and use this invention: Open the bottle by turning the cap counterclockwise, thus breaking the safety seal; Remove the airtight gasket; Install the cap back on the bottle by turning the cap clockwise until airtight; Shake the bottle so the food coloring mixes with the water inside the bottle changing the color of the water in the bottle.