Call of Duty Double Tap Root Beer Soda Metal Water Bottle Perk up with an increase in fire power when you drink your water from this cool Call of Duty water bottle! The Call of Duty Double Tap Root Beer Soda Metal Water Bottle is an Army Drab Green / Olive Drab Color metal with a silver screw-in top, BPA free. Inspired by the Call of Duty videogame series, it mimics the Soda brand of Perk-a-Cola, a game perk that allows a player to increase the rate of fire of your weapon and doubles the bullets fired, complete with a logo featuring the image or two (Double) bullets speeding to their target. “Cowboys can't shoot slow, or they'll end up below, when they need some help they reach for the Root Beer Shelf. YA THIRSTY PARTNER!?” – Double tap Jingle