Cola

The Cola is a usable item in Left 4 Dead 2. It is used to gain access to the gun shop in Dead Center, which is owned by Whitaker. He asks for a bottle of ice cold Cola before he will let you in, and you have to retrieve some from a nearby Save 4 Less store. While holding it, you will not be able to use any weapon other then the basic melee attack. It likely won't appear outside of Dead Center.