For the cake:
1 1/2 cups (6.25 oz) all-purpose flour
1 cup (7 oz) sugar
1 cup cold water
2/3 cup vegetable oil
1/4 (.75 oz) cup unsweetened cocoa powder
1 teaspoon baking soda
1 teaspoon white vinegar
1/2 teaspoon salt
1 teaspoon vanilla
For the Oreo whipped cream:
50 Oreo cookies, finely crushed
4 1/2 cups heavy cream
2 tablespoons granulated sugar
1 tablespoon pure vanilla extract