ice cube trays
Give the bottle of kefir a good shake before you pouring.
Pour the kefir into the ice cube trays and freeze.
Once completely frozen, take out of the freezer and let defrost for 5 minutes on the counter. This will make it easier to unmold.
Unmold the kefir cubes and put in a freezer bag or container and keep frozen until you need to use it.
If you don't want frozen kefir. Take the kefir cubes and put in a bowl and let melt at room temperature. Give it a mix and use or store in the fridge.