• Preheat oven to 350°F and grease a 9x13 inch pan with butter or non-stick baking spray.
• Sift the flour, cocoa powder, sugar, baking soda, and salt directly to the greased pan and carefully whisk to combine.
• Use a spoon to scoop out one large well or indention in the middle of the dry ingredients, as well as two small wells against the sides of the pan.
• Pour the vinegar and vanilla into the small wells on the sides and pour the oil in the big well. It's ok if the liquid ingredients spill over onto the rest of the cake.
• Pour the water over the top of the cake and whisk again to combine everything thoroughly.
• Bake for 25-35 minutes or until a toothpick inserted in the center of the cake comes out clean.

Frosting Instructions:

• Add powdered sugar, cocoa powder, and vanilla extract to a mixing bowl.
• Add water, two tablespoons at a time, mixing as you add, until the icing is a thick, but pourable consistency.
• Pour icing on top of the cooled cake and gently spread with a spatula. Allow to set before cutting and serving.