A bottle assembly including a body portion having a dividing wall, a first chamber for holding a first liquid and a second chamber for holding a second liquid. The base portion of the bottle assembly includes a weight distribution mechanism for counterbalancing the first liquid against the second liquid. The weight distribution mechanism is a flexible member positioned between a first base portion of the first chamber and a second base portion of the second chamber, the flexible member slidingly engaging an inner surface of the base portion of the bottle assembly. When the first liquid is reduced, the first base portion of the first chamber is displaced in a first direction and the second base portion of the second chamber is displaced in a second direction, the first direction being opposite the second direction.