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Posca was a refreshing drink for Roman soldiers, primarily made from water and sour wine or vinegar. Historical references to posca reveal that its precise recipe is somewhat lost to the ages; however, general accounts indicate that it kept soldiers hydrated and assisted them during strenuous campaigns. While we have scant details about the exact ratios of water to vinegar, references by ancient writers such as Plutarch hint that it might have been consumed in modest quantities, especially when compared to the drinks of the elite.