Transfer half of the homemade kombucha and half of the orange juice to a ½-gallon pitcher and stir.
Pour the orange kombucha into 16-ounce sanitized glass bottles and seal.
Leave the bottles in a warm, dark spot in your house (a pantry or a closet works great) for 3 days to allow for secondary fermentation.
Transfer bottles to the refrigerator and refrigerate until chilled.
Carefully open one of the bottles of orange kombucha (note that pressure will build during secondary fermentation, so be careful to point the bottle away from your face when opening).
Using a strainer, strain the kombucha into a glass. This will remove the orange pulp and any small SCOBYs that have formed during secondary fermentation.
Add 3 to 4 tablespoons of full-fat canned coconut milk. Mix and enjoy!