Combine all ingredients in a small bowl and mix with a spoon until well blended and smooth.
Add more water if necessary to thin it out. Note that it will thicken up in the refrigerator. If you need to thin it out after refrigeration, stir in extra water to improve the consistency.
Transfer to a glass jar and use 1-2 tablespoons per portion. Stores in the fridge for 7-10 days.