Thank you for posting this but even if this google translation is correct, I do not think this Catechism is infallible. If someone can prove it otherwise, let me know.
That is the thing. You can bring quotes from catechisms, Aquinas, saints, and other Doctors of the Church, but they are not infallible nor the final authority to which Catholics are bound and they cannot surpass the words of Our Lord Himself.
The matter for Baptism as given to us by CHRIST HIMSELF (see Jon 3:5) is true and natural WATER. (See also Eph.5:26; Per 1:20-21)
I can see it clearly that the proper form needed for baptism is water, physical, and tangible:
Infallible Magisterium:
A. Council of Lateran IV, The Catholic Faith:
The sacrament of Baptism, which at the invocation of God and the undivided Trinity, namely the Father the Son and The Holy Ghost, is solemnized in water, righly conferred to anyone in the form of the Curch is useful unto salvation.
B. Council of Florence, Exaltate Domino (1439):
Holy Baptism...holds the first place among the sacraments....the matter of this sacrament is real and natural water, it makes no difference warm or cold.
C. Pope Innocent III, Non ut Apponeres (1206):
In Baptism, two things are always and necessarily required, namely the words and the element (water)...You ought not to doubt that they do not have true Baptism in which one of them is missing.
D. Council of Trent, Canons of Baptism (Canon 2)
If anyone says that true and natural water is not necessary for baptism and thus twists into some metaphor the words of our Lord Jesus Christ" Unless a man be born again of water and the Holy Spirit" (Jn 3:5) let him be anathema.