Two canned vodka-based drinks have been launched, including one by a brewer, to capitalise on the growing demand for ready-to-drink (RTD) cocktails. Craft brewer Waterloo Brewing has begun producing Seagram Island Time Tiki Mule, based on the classic Moscow Mule cocktail. The Ontario, Canada-based company bought the rights to Seagram’s coolers in 2011 and has…