Abstract: A multi-chamber substance containment apparatus including a bottle, a spherical hollow member and a housing. The bottle includes an opening surrounded by a flange which has a spherical inner surface formed to receive the hollow member. The hollow member includes a lower opening and an upper opening. The housing is adjustably connected to the bottle to bias the hollow member against the spherical inner surface of the flange, thereby creating a seal around the opening of the bottle. In a closed position, a portion of the hollow member blocks the opening of the bottle. In an open position, the hollow member is rotated into an upright position such that the opening of the bottle and the lower opening of the hollow member are aligned to form a passage between an interior of the bottle and an interior of the hollow member.

Abstract: A multi-chamber bottle includes an opening surrounded by a flange which has a spherical inner surface formed to receive a hollow member. The hollow member includes a lower opening and an upper opening. The housing is adjustable to bias the hollow member against the spherical inner surface of the flange, to seal around the opening. When closed, a portion of the hollow member blocks the opening. When open, the hollow member is in an upright position such that the opening of the bottle and the lower opening of the hollow member are aligned. A method for mixing two substances includes disposing an amount of one substance in the bottle, adjusting the hollow member to block the opening of the bottle, and disposing an amount of another substance in the hollow member. To mix the substances, the hollow member is rotated into the open position and the apparatus is shaken.