The account itself shows that “the fine wine” that Jesus produced was real wine.
When Jesus converted water into wine, the Bible account says:
“When, now, the director of the feast tasted the . . . wine but did not know what its source was, . . . [he] called the bridegroom and said to him: ‘Every other man puts out the fine wine first, and when people are INTOXICATED, the inferior. You have reserved the fine wine until now.’” (John 2:9, 10)
Clearly it had to have been wine since grape juice cannot induce intoxication.
For more, see:
Lessons from the miracles of Jesus (WBTS)
Search For Bible Truths - ARCHIVE
Search For Bible Truths - Search Guide