A compartmented bottle has a primary compartment and at least one secondary compartment. The primary compartment has an exhaust aperture and an inlet aperture, and the secondary compartment has a secondary exhaust aperture. The inlet aperture of the primary compartment and the secondary exhaust aperture of the secondary compartment are fluidically connected by an inter-compartmental conduit, and a selectively actuated inter-compartmental valve is disposed in the conduit. The valve, which could comprise a cylindrical valve, has a closed condition wherein the secondary compartment is sealed and an open condition wherein the secondary compartment is in fluidic communication with the primary compartment. A toroidal collar can bridge an annular channel between the primary and secondary compartments to establish a continuous cylindrical surface. The valve can be operated by a handle disposed at a distal end of an actuation rod that is drivingly engaged with the inter-compartmental valve.