A beverage ingredient pod for releasing beverage ingredients into a bottle to create a mixed beverage includes a liquid-ingredient chamber, a solid-ingredient chamber, a frangible membrane between and separating the liquid-ingredient chamber and the solid-ingredient chamber, and a rigid piercer that extends to a point toward the frangible membrane. Upon a force applied to the beverage ingredient pod, a portion of the pod collapses and drives the rigid piercer through the frangible membrane. This mixes contents of the liquid-ingredient chamber with contents of the solid-ingredient chamber and releases the mixed contents from the beverage ingredient pod into a bottle below that is filled with a liquid, creating a mixed beverage.