"Unless, of course, the wedding at Cana is Jesus' own wedding. (We'll assume that Mary is not at long last marrying Joseph.) And if the wedding at Cana is Jesus', then it would indeed be his responsibility to replenish the wine.
Note also that immediately after the miracle: "The governor of the feast called the bridegroom, And saith unto him, Every man at the beginning doth set forth good wine; and when men have well drunk, then that which is worse; but thou hast kept the good wine until now." (John 2:9-10). These words would seem to be addressed to Jesus, such that Jesus and the bridegroom are one and the same."