And here, ladies and gentlemen, only one thing comes to mind: poska. In Rome, legions were drinking first.
The Emperors, wishing to emphasize their love and respect for the army, also drank this drink in public. The basis of the floor was, of course, simple water. Wine vinegar and spices were added to the water. It turned out a perfectly satisfying thirst drink. This drink was perfectly preserved in marching (army) conditions, possessed bactericidal properties. Wine vinegar perfectly killed the bacteria contained in unboiled water.
His presence, as it were, preserved the freshness of the water. Vitamins and minerals, found in herbs, dissolved in a duck. And so, with a poky legionary received a quality, cheap, fortifying everyday drink. Poska passed to the successor of Rome of Byzantium, and then was ... lost. The sailors in the era of the Great geographical discoveries were forced to drink fetid litter from the foul-smelling ship barrels.
To add to the safety in the water, vinegar did not occur to them. By the way, the proletarians of Rome added eggs to the pox for satiety. It is clear that a soldier to get fresh eggs is not an example more difficult than a peasant or a city dweller.