A beverage container lid for a container base with a reservoir is described. The lid consists of a shell that is removably mountable on the base. A drink passage extends through the shell and communicates with the ambient environment and a cartridge attached to the shell. A 2nd drink passage is in communication with the 1st drink passage and is formed between an outer surface of the cartridge and an inner surface of the shell. The cartridge comprises a valve that is movable between an open and a closed condition to control communication between the reservoir and the 2nd drink passage.