a body having a first end and a second end, said first and second ends being spaced from one another, wherein the body defines an interior space;

said first end having a first opening in fluid communication with said interior space and said second end having a first hole in communication with said interior space, said first opening configured to receive a user's mouth to draw liquid from a separate exterior source of liquid through said first hole into said interior space and through said first opening into the user's mouth, and wherein the liquid in the separate exterior source of liquid is exposed to atmospheric pressure;

said first hole is smaller than said first opening and is configured to create a pressure differential between the user's lungs and the atmospheric pressure when the user draws liquid through said first opening to lower the user's diaphragm while simultaneously requiring the user to open and then close the user's epiglottis, wherein the closing of the epiglottis prevents the liquid from entering the user's lungs;

a rotatable cover mounted on said second end covering said first hole, said cover having a second hole and a third hole, said second and third holes having different sizes, said rotatable cover being rotatable upon said second end to align either of said second and third holes with said first hole.