It doesn't. Jesus made wine that came straight from the cluster of the grape. This of course is a natural wine that is naturally already fermenting. But at the start of freshly squeezed juice that comes from grapes, it is not going to be instantly strong in alcoholic content. It takes time to ferment and the right conditions, too. Sometimes there is problems with natural fermentation, as well. That is why yeast is added. But Jesus does not need to make the wine strong in alcoholic content or intoxicating to make it taste insanely good or to make people go "Wow" that is like the best drink I ever had in my life. There was no need to make it alcoholic. Folks here wish it was alcoholic or intoxicating because they want to either justify the occasional drinking party at their house, get drunk on occasion, and or drink in public (Despite it possibly making their brother to stumble). They have a motive.
You start with your conclusion and then twist the Word to fit your conclusion. You have done this elsewhere with your KJV-ONLY nonsense.
In the OT Melchizedek provided wine (yayin) as per Genesis 14:18. The yayin contained alcohol.
In the NT Jesus provided wine (oinos) for the wedding as per the verses that have been discussed here in John 2. The oinos contained alcohol.
The difference between the first wine (oinos) served at the wedding and the wine (oinos) Jesus provided is that the latter tasted better.
Back in Jesus time, yeast wasn't added like it is today. Although some winemakers today still rely on wild yeast, most inoculate the must with cultered yeast cells, which are available in various strains that affect the characteristics and thus taste of the wine. I suspect that Last could explain this in considerable detail.
So the taste of the first wine served at the wedding was affected by the strain of wild yeast that got to it, by chance. The wine Jesus provided tasted better.
Most people can tell the difference between Welch's Grape Juice and Thunderbird. They can also tell the difference between Thunderbird and Screaming Eagle (it generally costs over $1,000 a bottle).
So the first wine at the wedding tasted like Thunderbird. The wine Jesus provided tasted like Screaming Eagle.
There is little historical, cultural, exegetical, contextual, or lexical reason to understand the wine Jesus provided to be anything but an alcoholic product similar to the first wine, other than it tasted better.
I'm done with this thread. It's going all over the place now.
I'm sure you will start another one that will astound me with its babble-on (Babylon).