Final answer:
An average Roman likely drank the equivalent of about one liter of mixed wine (diluted with water) daily, given their practices of moderation and social norms.
Step-by-step explanation:
On average, a Roman person did not drink an entire amphora of wine per day, as that would have been a considerable amount, typically more than one person would consume. The consumption of wine in ancient Rome was a daily practice, but it was commonly mixed with water for drinking, as drinking undiluted wine was looked down upon and considered a behavior of barbarians or alcoholics.
Given the standards of moderation practiced by the Romans and the fact that ancient beverages like wine were not as strong as modern alcoholic drinks, it is more realistic that an average Roman might consume the equivalent of perhaps one liter of mixed wine (watered down) throughout the day.