Question: Where is buttermilk in the grocery store?
Answer: Buttermilk is located in the dairy section of the grocery store. It is typically shelved next to the milk, half-and-half, and cream. Buttermilk is inexpensive. You can purchase a pint for under $1.50 and a half gallon for approximately $2.50. Organic, as is typical, will cost more. Buttermilk will last about two to three weeks after opened.
You can create your own buttermilk substitute at home using just milk and lemon juice or vinegar. Mix one cup of milk and one tablespoon of lemon juice or vinegar. Allow the ingredients to stand for about 10 minutes. Simple as that, you have created a buttermilk substitute. You can view other buttermilk substitutes here.