Ice block
Created in a Tub at (TBD height) high altitude. Available at night time (6pm-6am). Add 20 water to tub, wait for it to evaporate.
Ice Block in inventory melts at 10am give or take a couple of minutes. 8 Sturdy Tubs in cp and ice blocks had not melted by 12:00pm.
Spouse Warping with Ice Blocks in your inventory will melt them and give you a message in main 'You feel wet.'
Creating a refrigerator
Placing 2 blocks in a chest does not melt at 10am, adding more blocks makes the chest a refrigerator.
When a chest becomes a refrigerator, it consumes the ice that was contained in the chest. The chest will then appear with weight in the chest with no associated items equal to the number of blocks of ice consumed. It is unknown if the number of blocks of ice converted this way have any effect. The chest will consume all ice contained inside when it converts.
Have had 10-11 blocks in the chest for several days and it seems to keep jugs of milk longer.
Chests hold 22 ice blocks for the refrigerator, any more are stashed as removable items.