Honestly .. consider buying your own Milk Kefir grains. it is so simple to create ..
Beginners guide to making milk kefir ..
You need at least one Teaspoon of milk kefir grains ..
Place about 1 teaspoon of grains into a jar..
Pour in your chosen milk (250ml)..
Place the lid on, or cover with a cloth and a rubber band.
Let your jar sit at room temperature away from direct sunlight for 24-48 hours ..
Strain finished kefir into a jar through a non-metallic, fine-mesh strainer ..
That's it, nothing complicated and you will have a never ending supply of Kefir milk.