Brittany is not a renowned region for its wine. Otherwise, there are other specialities:
Breton beer
Cider
Calvados: apple brandy
Chouchen: mead it's a blend with alcohol and honey; it is very sweet
Muscadet: dry white wine, perfect with local seafood; true, it doesn't come from Brittany, but is from the nearest vineyard area, Pays de la Loire