The words for ice קרח and vapor הבל exist in Hebrew, therefore since it says that the Spirit was over the waters it means it was liquid
The OP claims
That implies that water attained fluidity after the creation of light
That is not correct chronologically
“The earth was without form and void, and darkness was over the face of the deep. And the Spirit of God was hovering over the face of the waters.”
Spirit of God was on the face or surface of the waters. It is only after this that light was spoken and called forth in verse 3
“And God said, “Let there be light,” and there was light.”
It’s also disheartening to see in the comments section modern secular cosmological being imposed onto Biblical cosmology. Earth in the Bible is not a planet, in fact planets cannot exist in Biblical cosmology. The earth is a plane with the underworld not a globe spinning and a molten core.
I suspect the OP is trying to understand why the water was liquid, if it was liquid. But that’s probably because he too is thinking in terms of modern cosmology and vast empty space. The water was liquid because even if it would freeze eventually given the circumstances, it was so fresh, therefore it was liquid. This is another point towards the beginning being on the first day in verse 1 and not eons prior.
The OP sin the comments has asked a question that in part if scientific and factual but comes from a theoretical framework that is unrelated to the Cosmology of the Bible.
Seeing the current temperature of the universe (which he imagines is a vast empty vacuum of space, meaning modern, anti-God, secular, cosmology propaganda) how could water be liquid at second one, minute one, hour one, day one? I stop at day one because for him it’s sufficient for a light to exist for the waters to warm up or what actually occurred they maintained water.
Since this is a Biblical question it will have to be answered exegetical Ku and hermeneutically from the perspective of the author who inspired it and described His own creation and from the perspective of those who at the time believed the revelation description and the God who describes it.
While still remaining in the confines of scientific integrity but not restrained by modern cosmology that among other things demands for example a 13+ Billion year time span, whereas the Bible claims we are approaching according the Essence calendar the year 7,000 from day one of Creation, I will endeavor to explain why the waters were and remained liquid within a Biblical cosmology.
If there is nothing, meaning not even a space to place it in, then that nothing which doesn’t exist has no temperature. Heat transfers, but heat does not transfer through or into nothing. Beyond the universe God created which is not as massive as modern cosmology wants us to believe (you can continue to believe what you like, I’m describing Biblical cosmology and the answer to a Biblical cosmology question must be answered from a Biblical cosmological framework). Beyond this universe there is nothing. Heat cannot transfer into nothing.
Therefore this heat in this limited space, heavens (made of waters) and the earth as verse 1 indicates is confined to it.
Here is the point
When God decided to create something like waters and earth, he didn’t have to create them cold. He could have created them warm or hot. Therefore the waters within this limited space called Biblical universe were liquid, because they were created warm and they filled the space. Heat could not be lost.
Above and outside the universe (don’t think millions of light years away) think hundreds, possibly thousands of miles away) outside of this material thing, in the realm of nothing was the Spirit of God hovering over that something. He was hovering over waters or over the heavens that had not yet been separated. And if there is no separated heaven, then there are no heavenly bodies or beings to place those angelic creatures into. The universe (waters and earth) were that fresh. And therefore water could be liquid
All this could be so much easier to describe to someone who (even if they don’t accept Biblical Cosmology) understands Biblical Cosmology
Please don’t ask anymore questions on Biblical cosmology, research it yourself. There is plenty of material on the subject.