Yes! Be sure to remove the electronic smart disk from the cap to avoid condensation or other conditions that may cause moisture in the cap mechanism.
Tritan® container: The container can be refrigerated or frozen. When freezing, do not fill to the top (we recommend no more than 3/4 full) to allow room for the liquid to expand as it hardens.
MyHydrate cap: Remove the electronic smart disk before freezing or refrigerating the cap. Make sure the container is in an upright position.