This, the first of his miraculous signs, Jesus performed in Cana of Galilee. He thus revealed his glory, and his disciples put their faith in him.
According to the gospel of John, the first miracle Jesus did was to make water into wine. It was only his first. To make water into wine might not have impressed the wedding guest, since many of them most likely had already got to much to drink. But this miracles opened the eye and hart of His disciples. If they would not have put their faith ion Him, than nobody would have done so.