"…Let us watch and BE SOBER. For those who sleep, sleep at night, and those who get drunk are drunk at night. But let us who are of the day BE SOBER…" (1 Thessalonians 5:6-8) Sober – Nepho: "to be free from the influence of intoxicants." (Vine's Expository Dictionary of New Testament Words)
Firstly: nobody is disputing that alcoholic wines existed (but non-fortified). Yet here is some of the evidence why anybody who wished to avoid all alcoholic wine was able to avoid this type in Biblical times.
…the Roman writer Cato, in his treatise On Agriculture, gave this prescription: ‘If you wish to keep new wine sweet the whole year round, put new wine in a jar, cover the stopper with pitch, place the jar in a fishpond, take it out after the thirtieth day; you will have sweet wine all the year round.’ The ancients knew if somebody wanted to get intoxicated, then the sweetest wines were very unsuitable.
When the master of the feast had tasted the water that was made wine [oinos]… the master of the feast called the bridegroom. And he said to him, “Every man at the beginning sets out the good wine, and when the guests have well drunk [are satisfied], then the inferior. You have kept the good wine until now!”
Oinos a generic word: NOT ALL oinos wine alcoholic (water to wine)
…oinos is used in the Septuagint for both fermented and unfermented grape juice. Since it can mean either one, it is valid to insist that in some cases it may simply mean grape juice and not fermented wine.