Here's a slightly lengthy historical answer to the question, but the Greeks and Romans of the time generally drank diluted wine that would come out to around 3-6% alcohol content. So while the wine itself certainly stayed in the 12-16% range, they would dilute it with a ratio of water. This article says there's written evidence from the time that they would use two parts wine and three parts water to get a good mixture, while half and half was too strong for their liking.
Jesus turned water into wine. Not water into water and water. This was a party, not an environment or situation where the point of drinking was hydration with liquid that alcohol would help sterilize water like a battlefield or a march where your example would be the norm. Scripture is clear.
Here's a slightly lengthy historical answer to the question, but the Greeks and Romans of the time generally drank diluted wine that would come out to around 3-6% alcohol content. So while the wine itself certainly stayed in the 12-16% range, they would dilute it with a ratio of water. This article says there's written evidence from the time that they would use two parts wine and three parts water to get a good mixture, while half and half was too strong for their liking.
https://history.stackexchange.com/questions/57158/how-alcoholic-were-ancient-greek-and-roman-wines-before-and-after-dilution
Jesus turned water into wine. Not water into water and water. This was a party, not an environment or situation where the point of drinking was hydration with liquid that alcohol would help sterilize water like a battlefield or a march where your example would be the norm. Scripture is clear.