As of now, I have 5 different kinds of milk/cream in my fridge. Half and half, whipping cream, whole milk, 1% milk, and soy milk. I am making a recipe that needs buttermilk. Luckily, I was saved by my good friend google who provided a simple recipe for buttermilk.
1 cup milk
1 tbsp. white vinegar or lemon juice
Combine the milk and the vinegar/lemon juice. Let the mixture stand for 5 minutes. Magic!