Mix coconut yogurt and apple cider vinegar. Add enough thickener to reach desired consistency. Stir until very smooth.
Notes
I only make enough for one serving so I don't waste it. It would be easy to make bigger batches and refrigerate.
Substitutions
Prepared foods like yogurt alternatives vary widely in ingredients. Be sure to verify that you have found a brand that does not contain and is not contaminated with your allergens.
Use any starch or flour for thickening that is safe for your allergen set.
Coconut: Although classified by the FDA as a tree nut, coconut is not a common allergen and is not related to tree nuts. If you have a tree nut allergy, consult your physician to find out if you need to avoid coconut.
Gluten: Gluten is a protein found in specific grains (wheat, spelt, kamut, barley, rye). Other grains are naturally gluten-free but may have cross-contact with gluten-containing grains. Look for certified gluten-free products if you need to avoid gluten. Find out more about wheat and gluten substitutions.
Milk and Soy Substitutions: Alternative dairy-free milk beverages and products will work in most recipes. Find out more about milk substitutions and soy substitutions.