Jesus answered her, “If you knew the gift of God and who it is that asks you for a drink, you would have asked him and he would have given you living water.”
Water, water everywhere. Remember the Kevin Costner flop, Waterworld, where our Kevin grew gills? John's gospel has become a waterworld itself. First we had water into wine - the water of purification turned into the new wine of the Spirit. Then we had the water of Baptism, washing away the old to make room for the new life of resurrection. Now we have the old water of Jacob's well replaced by the living water of the Gospel.