The BBC have reported that "The amount of water used to produce food and goods imported by developed countries is worsening water shortages in the developing world" (story here).
The first example they give is the statistic that the whole process of making one pint of beer uses 130 pints of water. How this figure was arrived at they don't say. Or exactly how much beer is imported into Britain from developing countries. But trying to blame beer for environmental problems sounds like they're really scraping the barrel to me.