Most ancient Romans drank wine mixed with water and spices, but soldiers and slaves drank posca, which was a diluted vinegar beverage. Although beer was invented at the time, the ancient Romans refused to drink it because they considered it to be a barbaric drink.
The wine that ancient Romans drank was called "calda." Calda was a mixture of warm water, wine and spices, which was usually consumed during the winter months. Sometimes, they would drink wine sweetened with honey called "mulsum," and no one drank straight wine. No matter what time of day it was, the wine was always watered down.