Why is wine associated with St. John the Apostle?

In the Rituale Romanum of the Catholic Church one can find a blessing for wine which is reserved for the Feast of St. John the Apostle (December 27). Why does the Catholic Church associate this tradition with St John? Occasionally artists show a snake or a dragon coming out of a chalice with St. John the Apostle. El Greco: St. John the Evangelist, 1595-1604