the only difference is that it’s thicker than buttermilk, but that’s easy to fix! Simply thin plain yogurt with a bit of milk ...

That's easy: Use non-dairy milk. Soy milk in particular makes a great substitute for regular milk and creates a nice, thick buttermilk replacement. All you have to do is add lemon juice or vinegar ...

Yes, and it's easy, requiring little more than cream ... especially when baking. Can I substitute sour cream for buttermilk? Yes, although you'll likely want to thin it out with milk or water ...