A portable storage and dispensing device for powder to be mixed with liquid is provided. The device, when actuated, dispenses measured powder portions from a reservoir of soluble powder and communicates those measured portions to a drinking vessel or container. The device includes a cannister having an interior cavity for positioning a powder reservoir which is adapted for dispensing with only one hand while gripping a central portion of the cannister. A dispensing end of the cannister is adapted to deposit the powder in small-mouthed containers and concurrently avoid spillage.