How to make buttermilk

I have decided to write several how to articles on how to create and do certain things.
The first item on the list is how to make a Buttermilk substitute and how to get buttermilk from a bottle of heavy whipping cream.

Many years ago in a cooking class I had to make a certain type of muffins that called for buttermilk, the problem was I had no buttermilk. Luckily today we have the gift of the internet and therefore can make a substitute quickly and continue on with your recipe.

Here is a buttermilk substitue recipe I found wonderful
Use one tablespoon of vinegar or lemon juice and add it to a measuring cup. Then simply fill the measuring cup up with milk to the one cup line. Let this stand on your counter for five minutes. It will bubble and curdle once the five minutes is up you are ready to use this substitute on your recipe.
If you would like to make real buttermilk here is another recipe I found

Fill a quart jar half way with heavy whipping cream. Place a lid on it and begin shaking. In a moment it will turn to whipped cream, keep shaking. After about 10 minutes the whipped cream will separate into a liquid and a yellow blob. The liquid is butter milk and can be used in your needed recipe the yellow blob is butter.