Thales (one of earliest Greek philosophers) said, as reported by Hippolytus, in the Refutation of all Heresies
the archê (principle) and the end of all things is water. All things acquire firmness as this solidifies, and again as it is melted their existence is threatened; to this are due earthquakes and whirlwinds and movements of the stars. And all things are movable and in a fluid state, the character of the compound being determined by the nature of the principle from which it springs
And in the Rig-Veda, verse 10.129:
There was neither existence nor non-existence then.
There was neither sky nor heaven beyond it.
What covered it and where? What sheltered?
Was there an abyss of water?
And, in Genesis, at the very beginning we have:
In the beginning God created the heaven and the earth.
And the earth was without form, and void;
and darkness was upon the face of the deep.
And the Spirit of God moved upon the face of the waters.
Does this point towards a common Indo-Aryan philosophic culture?
A curious feature is that:
in [modern] cosmology we typically model the matter filling the universe as a perfect fluid.
From Carrolls spacetime and geometry, a textbook on GR ie not a popular account.