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 first container having a bottom wall, a sidewall surrounding the bottom wall, defining a first container cavity, and defining a first container upper enclosed opening fluidly coupled to the first container cavity;
• a second container having a bottom wall, a sidewall surrounding the bottom wall of the second container, defining a second container cavity, defining a second container upper enclosed opening fluidly coupled to the second container cavity, having a piston coupled to the sidewall of the second container in a watertight configuration and operably configured to linearly translate along a piston translation path within the second container cavity, and defining at least one air aperture through at least one of the sidewall of the second container and the bottom wall of the second container at a location outside of the piston translation path;
• an inner sidewall having a collapsible accordion configuration, with an upper portion selectively removably couplable to a secondary inner sidewall of the second container in a male-female coupling configuration, with a lower portion coupled to the piston, and defining an inner sidewall cavity, the inner sidewall operably configured to have a collapsed configuration along an inner sidewall translation path and an expanded configuration along the inner sidewall translation path within the second container cavity;
• a container linking structure selectively removably couplable to the second container in a watertight and male-female coupling configuration;
• a stem member selectively removably couplable to the piston in a male-female coupling configuration and having a grasping portion thereon;
• and
• a straw member sized and shaped to be inserted within the first container upper enclosed opening and defining an enclosed conduit extending from a distal end of the straw member to the container linking structure, the stem member operably configured to apply a force on the piston to linearly translate the piston and inner sidewall along the inner sidewall translation path within the second container cavity and generate a negative pressure within the enclosed conduit for transportation of a liquid configured to be housed in the first container cavity to the second container.