Abstract: The proposed formula-mixing bottle relates to baby feeding vessels. It includes a first container with a bottom, a second container with a bottom, and a cap. The second container's bottom is formed by a closure member in the form of a raisable disk of a disk valve. The closure member has a screw shaft disposed on one side thereof, and the inside surface of the second container has a seal disposed thereon forming a seat for the disk of the closure member. The screw shaft is provided with a guide groove and is disposed inside a retaining sleeve having an arrester mounted in the opening thereof such as to be capable of interacting with the guide groove, and of restricting rotation of the screw shaft. The proposed bottle has a simplified structure as a result of the use of elements having less complex shapes.