Yes within reasonable limits. Jehovah's Witnesses can drink alcohol.
Beverages they can drink including
There are no limitations on the type of alcohol they can consume or the quantity. However getting drunk is not allowed. Being intoxicated or drunk is a reason for disfellowshipping, which means excommunication from the church and shunning.
Drinking alcohol to excess violates one of the many rules Jehovah's Witnesses have, however that doesn't stop some from drinking too much and denying it or covering it up.
Re: 'Judge' Joseph Franklin Rutherford, former president of the Watchtower: "Although Jehovah's Witnesses have done everything possible to hide accounts of the judge's drinking habits, they are simply too notorious to be denied. Former workers at the Watch Tower's New York headquarters recount tales of his inebriation and drunken stupors. Others tell stories of how difficult it sometimes was to get him to the podium to give talks at conventions because of his drunkenness. In San Diego, California, where he spent his winters from 1930 until his death, an elderly lady still speaks of how she sold him great quantities of liquor when he came to purchase medicines in her husband's drugstore." (Penton, James M. (1997), Apocalypse Delayed: The Story of Jehovah's Witnesses (2nd ed.), pp. 72,73, University of Toronto Press, ISBN 0-8020-7973-3, cited from Wikipedia, Joseph Franklin Rutherford)