Containers and methods and devices for enhancing thermal energy transfer between container contents and external environment

A modular retrofit device for adjusting the temperature of at least one beverage container, comprising:

• a main body portion adapted and configured to be removably positioned at least partially within a container having a liquid bath, the main body portion including at least one space configured for holding at least one beverage container;
• at least one adjustable leg configured and arranged to selectively be adjusted downwardly to situate the height of the main body portion with respect to the container having the liquid bath;
• a pump coupled to and removable with the main body portion;
• and
• a conduit coupled so as to be in fluid communication with the main body portion;
• wherein activation of the pump is operative to draw liquid from the liquid bath into the main body portion and direct the liquid over the at least one beverage container disposed in the at least one space defined in the main body portion.