Craft beer sales have been growing by double digits, even as overall beer sales have flattened. And several independent craft beer makers — all based in the Western U.S. — are expanding production to the East. But to keep the flavor true, they have to tinker with beer's main ingredient: water.
Every day, a half-dozen employees of Oskar Blues Brewery file into a small room in Brevard, N.C. It's cluttered with boxes, petri dishes and test tubes.