Abstract: A beverage formula container for use with a beverage receptacle, the beverage formula container including a container body extending from a first open end configured for dispensing a beverage to a second open end configured for attachment to a beverage receptacle body of the beverage receptacle, the container body including a flared section and an at least partially deformable section in proximity of the flared section and a sealing member configured to be inserted into the second end so as to sealingly engage an inner surface of the container body proximate the flared section so as to form a chamber between the sealing member and the first end, the chamber being configured to receive beverage formula therein, and wherein deformation of the deformable section allows the sealing member to disengage the inner surface of the container body and pass through the flared section and the second end, thereby releasing beverage formula through the second end into an attached beverage receptacle body.