How Can Different Craft Whiskeys Come From One Big Distillery?

It’s long been an open secret that a lot of “craft” distilleries buy and bottle whiskey from an Indiana factory called Midwest Grain Products (MGP). You only need flip over a bottle and see “Distilled in Lawrenceburg, IN” to know who is doing it. Often it’s because the distillery’s own whiskey is still aging, and the company needs something to sell during the years of maturation. Dozens of brands offer hundreds of bourbons and ryes that start—in theory—as the same, exact thing. And yet, why do so many of these MGP whiskeys taste so different?

Age matters, of course. So...