That the Manicheans practiced the Water Communion is quite clear, like clear pure water.
Ablutions too, in connection with prayers and ritual, were important to Mani for the same reason as outlined above. His family, it is said, were members of a religion that involved sacred ablutions as well.
"The Encratites, who opposed the use of all intoxicating drinks, consistently communed with water. In the fourth century the users of water in the Communion were called "Aquarii" or "Hydroparastatae" and, under the Code of
Theodosius, were liable to death for their practise."
"Others known as having substituted water for wine are: Tatian, a pupil of Justin Martyr; Galatia, the confessor of Alcibiades of Lyons; Pionius, the Catholic martyr of Smyrna; the Marcionites; the Ebionites; the Montanists; and the Therapeutae of Philo."
In the Edict of 382, Theodosius pronounced the sentence of death on all those who took the name of Encratites, Saccophori, or Hydroparastatæ, and commanded Florus, the Magister Officiarum, to make strict search for these heretics, who were Manichæans in disguise.