A dry powder and liquid mixing apparatus provides a dry powder container integratable with a liquid container, and a lid engaging both the dry powder container and the liquid container to enable selectable storage and mixing of powder and liquid, such as mixing dry infant formula with water. Through simple manual twisting of the lid about the liquid container to a closed state, a user is able to selectively prevent mixing of stored dry powder and liquid. Likewise, through simple manual twisting of the lid about the liquid container to an opened state, a user is able to selectively enable mixing of the dry powder with the liquid, by shaking the apparatus while the lid is in an opened state, resulting in a consumable mixed formula.
