A bottle lid provides a fluid tight seal that holds liquid contents in a bottle within the bottle, while preventing unwanted entry of another liquid or a gas, such as air, into the bottle, and in te case of a carbonated liquid in the bottle, maintains the carbonation while preventing the build up of internal overpressure in the bottle. The bottle lid includes a cap, and a lever actuated operating member, placed in the mouth of the bottle, with having a sealing element on the operating member. Actuation of the lever causes an elastic deformation of the sealing element, which expands radially outwardly against the inner wall of the bottle to provide the fluid-tight seal.