It happened. There is no natural explanation. It is a true miracle.
It happened, since John was one of those seing it and the man who wrote the Gospel.
There is no natural explanation - as seen in the explanation in the video here:
The Wedding of Cana was thus a true Miracle.
Or like the Bavarian said - "do you call that news? Was just a miracle that happened." (The German joke about the Bavarian at Cana is even better: "Kan wunder, is halt a Wunder geschehn")./HGL
PS, I do not know what came after it, but Christ is not repeating it because Atheists want to "test it" by asking Christian children to ask for a repeat. Fides ex auditu, that miracle was for there. We know about it because we heard about it, through the Church keeping this Gospel and recording its authorship./HGL