Q. 1. Is it true that if water is not added to the wine prior to its Consecration of the bread and wine into the Body and Blood of Christ, the Consecration is not valid, nor is the Holy Mass valid?
A. 1. The wine must have a small amount of water mixed with it in order to be properly consecrated.
I quote "Inaestimabile Donum," the Instruction Concerning Worship Of The Eucharistic Mystery, by James R. Cardinal Knox, Prefect Virgilio Noe Assistant Secretary, prepared by the Sacred Congregation for the Sacraments and Divine Worship; Approved and Confirmed by His Holiness Pope John Paul II, 17 April 1980:
# 8. "Matter of the Eucharist. Faithful to Christ's example, the Church has constantly used bread and wine mixed with water to celebrate the Lord's Supper. The bread for the celebration of the Eucharist, in accordance with the tradition of the whole Church, must be made solely of wheat, and, in accordance with the tradition proper to the Latin Church, it must be unleavened. By reason of the sign, the matter of the Eucharistic celebration "should appear as actual food." This is to be understood as linked to the consistency of the bread, and not to its form, which remains the traditional one. No other ingredients are to be added to the wheaten flour and water. The preparation of the bread requires attentive care to ensure that the product does not detract from the dignity due to the Eucharistic bread, can be broken in a dignified way, does not give rise to excessive fragments, and does not offend the sensibilities of the faithful when they eat it. The wine for the Eucharistic celebration must be of "the fruit of the vine" (Lk. 22:18) and be natural and genuine, that is to say not mixed with other substances." [Ref.: 19 Cf. ibid., nos. 281-284; Sacred Congregation for Divine Worship, Instruction Liturgicae instaurationes, no. 5; Notitiae 6 (), no. 37.]