"To this day reverence for water is deeply ingrained in Zoroastrians, and in orthodox communities offerings are regularly made to the household well or nearby stream.
"[1] The ape zaothra ceremony—the culminating rite of the Yasna service (which is in turn the principal act of worship)—is literally for the "strengthening of the waters."
In both Avestan and Vedic Sanskrit texts, the waters—whether as waves or drops, or collectively as streams, pools, rivers or wells—are represented by the Apas, the group of divinities of the waters.
[3] Aside from Apas herself/themselves, no less than seven Zoroastrian divinities are identified with the waters: All three Ahuras (Mazda, Mithra, Apam Napat), two Amesha Spentas (Haurvatat, Armaiti) and two lesser Yazatas (Aredvi Sura Anahita and Ahurani).
In a development of a cosmogonical view already alluded to in the Vendidad (21.15), aban is the essence of a "great gathering place of the waters" (Avestan: Vourukasha, middle Persian: Varkash) upon which the world ultimately rested.
The great sea was fed by a mighty river (proto-Indo-Iranian: *harahvati, Avestan: Aredvi Sura, middle Persian: Ardvisur).