Wine is any drink made from fermented grapes.
The planet Caladan was known throughout the known universe for its fine wines. It was a fairly successful export for Caladan and for House Atreides, who ruled there for more than 10,000 Standard years.
Caladani wines were still regarded as excellent almost 5000 years after the days of Leto the Just. During the time of the Honored Matres, Danian wines were still popular choices for fine dining on various planets, including Gammu.