Quick Wacky Chocolate Cake
["1 1/2 c. flour", "3 Tbsp. cocoa", "1 c. sugar", "4 Tbsp. cooking oil", "1 tsp. vanilla", "1 c. cold water", "1 tsp. baking soda", "1/2 tsp. salt", "1 Tbsp. vinegar"]
["Grease an 8 x 8-inch pan for single, 13 x 9 x 2-inch pan for double recipe.", "(To double recipe, double all ingredients.)"]
["flour", "cocoa", "sugar", "cooking oil", "vanilla", "cold water", "baking soda", "salt", "vinegar"]