This top beer stock is undervalued after a brutal sell-off this year.Constellation Brands (STZ +0.70%) has a long record of paying dividends and delivering returns to shareholders. However, the stock has moved in the opposite direction from the S&P 500 index over the past two years. Over the last 12 months, the stock has declined by 41%, compared to a 12% gain for the S&P 500.Sales of the company's top beer brands, such as Corona and Modelo, have suffered due to economic pressure on its core customers. Stil ...