A shot is usually 1.5 fl oz. And 2 fluid ounces (4 tablespoons), is a double shot . "Neat" is also 2 fl oz but in a highball glass. A double "neat" is 4 fluid ounces (8 tablespoons). When you hear "give me a double", this is what it usually refers to. To make it easy, 1/4 cup = 2 fluid ounces and 1/2 cup = 4 ounces.