John is making it clear that it is the presence of the Holy Spirit in our lives that takes away our frustration of trying to find satisfaction in this world. It’s the Holy Spirit that turns us into people who overflow with life to love others instead of sucking up other people’s life. When we come to Christ, what do we drink? We drink in His promises of real life and the power of the Spirit. This is the living water Jesus offers the Samaritan woman and this is the living water He offers us today. This is how Jesus turns a worldly, sensual adulteress from Samaria into a fountain of life. This is how he takes us and turns us into fountains of life.