Ensure all of your equipment is clean and dry.
If you have purchased half and half that is not ultra pasteurized it is important to heat the milk to 195 degrees first. This ensures other microbes won't compete with the l reuteri strain.
Then prepare an ice bath in a larger bowl and put the heated pot of half and half in the ice bath to cool to 100 degrees.
Skip the step above if you buy ultra pasteurized half and half.
In a glass bowl mix the prebiotic fiber and the l reuteri packet.
With the half and half you can now take 1 1/2 cups and mix it with a whisk into the powders. Ensure it is well dissolved and incorporated.
Add the remaining half and half to your whisked mixture. Ensure there is room for this to expand. Otherwise if you use a quart jar like I did in the video it may bloom over.
Cover with a lid or muslin cloth and rubber band and put into your instant pot.
Keep it at 100 degrees for 36 hours.
Store in the refrigerator well sealed.