Additive mixing system

A mixing straw comprising:

• a straw comprising a first straw portion and a second straw portion;
• and
• a mixing attachment comprising:
• a mixing body for connection between the first and second straw portions and in line therewith to define a common liquid channel;
• and
• an inlet body connected to a side of the mixing body at a first end thereof and extending outwardly from the mixing body, the inlet body including:
• an outlet at the first end of the inlet body;
• an inlet at a second end of the inlet body, opposite the outlet, the inlet configured to couple to an additive receptacle for receiving additive substance therefrom;
• a channel within the inlet body and fluidly connecting the inlet to the mixing body via the outlet for passage of the additive substance therethrough;
• and
• at least one valve within the inlet body to at least prevent backflow of the additive substance out of the inlet;
• and
• wherein suction at a first end of the straw, when in communication with the liquid, causes suction of the liquid into the mixing body and suction of an amount of the additive substance through the inlet body and into the mixing body, where the liquid and the amount of the additive substance are mixed, and subsequently suctioned through the first end of the straw.

A mixing system comprising:

• a straw comprising a first and a second straw portion, the first straw portion including a first end of the straw and the second straw portion including a second end of the straw;
• an additive receptacle housing an additive substance;
• and
• a mixing attachment comprising:
• a mixing body for connection between the first and second straw portions and in line therewith to define a common liquid channel;
• an inlet body connected to a side of the mixing body at a first end thereof and extending outwardly from the mixing body, the inlet body including:
• an outlet at the first end of the inlet body;
• an inlet at a second end of the inlet body, opposite the outlet, the inlet configured to couple to an additive receptacle for receiving additive substance therefrom;
• a channel within the inlet body and fluidly connecting the inlet to the mixing body via the outlet for passage of the additive substance therethrough;
• and
• at least one valve within the inlet body to at least prevent backflow of the additive substance out of the inlet;
• and
• wherein suction at a first end of the straw, when in communication with the liquid, causes suction of the liquid into the mixing body and suction of an amount of the additive substance through the inlet body and into the mixing body, where the liquid and the amount of the additive substance are mixed, and subsequently suctioned through the first end of the straw.

A method of delivering a controlled dose of an additive substance to a user via a drinking tube, the method comprising:

• providing a mixing attachment coupled to the drinking tube, the mixing attachment comprising a mixing body and an inlet body coupled to the mixing body, the inlet body including an outlet at a first end of the inlet body, an inlet at a second end of the inlet body, a channel within the inlet body and fluidly connecting the inlet to the mixing body, and at least one valve within the inlet body;
• coupling an additive receptacle to the inlet of the inlet body, the additive receptacle housing an additive substance;
• applying suction to a first end of the drinking tube, wherein the suction causes liquid to be drawn into the mixing body and causes an amount of the additive substance to be drawn through the inlet body and into the mixing body via the venturi effect, where the liquid and the amount of the additive substance are mixed and subsequently suctioned through the first end of the drinking tube;
• and
• controlling the amount of the additive substance drawn into the mixing body by adjusting a diameter of the inlet, wherein decreasing the diameter of the inlet increases the amount of additive substance drawn into the mixing body, and wherein increasing the diameter of the inlet decreases the amount of additive substance drawn into the mixing body.