In mixing bowl, add buttermilk, water, oil, sugar, eggs, baking soda and salt; stir together until it is well combined. Add in flour and cocoa powder and whisk until smooth and there are no lumps. Pour batter evenly into prepared pan(s).
In mixing bowl, add buttermilk, water, oil, sugar, eggs, baking soda and salt; stir together until it is well combined. Add in flour and cocoa powder and whisk until smooth and there are no lumps. Pour batter evenly into prepared pan(s).