The Best Chocolate Cake Recipe

INGREDIENTS
3 cups all-purpose flour
3 cups granulated sugar
1 1/2 cups unsweetened cocoa powder
1 tablespoon baking soda
1 1/2 teaspoon baking powder
1 1/2 teaspoon salt
4 large egg
1 1/2 cups buttermilk
1 1/2 cups warm water
1/2 cup vegetable oil
2 teaspoons vanilla extract