Hydration Powder Attracts Grateful Dead’s Bob Weir as Investor

Bob Weir, a founding member of the Grateful Dead, used to keep water and Gatorade on hand to stay hydrated on tour. In particularly hot weather, he said, he would soak his T-shirt in a cooler, wring it out and wear it wet. Now Mr. Weir uses a hydration powder created by his doctor, which he and other rock musicians are backing as investors.