Linking structure and container assembly to facilitate liquid transfer from a donor container to a recipient container

A container assembly to facilitate liquid transfer from a donor container to a recipient container comprising:

• a recipient container:
• having a bottom wall and a sidewall surrounding the bottom wall of the recipient container;
• defining a recipient container upper enclosed opening and a recipient container cavity;
• having a recipient inner sidewall disposed in the recipient container cavity, having an inner bottom wall disposed in the recipient container cavity and defining a stem member aperture, and defining a recipient inner container cavity with the recipient inner sidewall and inner bottom wall that is fluidly coupled to the recipient container upper enclosed opening;
• and
• defining at least one air release aperture through at least one of the recipient inner sidewall and the inner bottom wall;
• a piston coupled to the recipient inner sidewall in a watertight configuration, disposed within the recipient inner container cavity, and operably configured to linearly translate along a piston translation path within the inner container cavity;
• and
• a stem member selectively removably couplable to the piston in a male-female coupling configuration, sized and shaped to be received through the stem member aperture, having a grasping portion thereon, and operably configured to be moved through the stem member aperture, the recipient container cavity, and the recipient inner container cavity to apply a force on the piston to linearly translate the piston within the inner container cavity and generate a negative pressure within the inner container cavity.