Dearest 'Faithful'... sorry, but you are in error.
In BOTH cases, above the expanse AND below it, the water is the 'water' of life. Below the expanse, such 'water' is H20... which every PHYSICAL living thing... from plant and vegetation, to flying creature and winged creature (insects), wild beast and domestic animal... and creature of the sea... NEEDS... in order to live and exist... HERE... in the physical realm.
ABOVE the expanse, it is HOLY SPIRIT... 'life's water'... 'living water'... which every SPIRITUAL thing needs... to live and exist... THERE... along with the 'leaves from the Tree of Life', the 'bread of life'... manna.
John 5:48-55
Genesis 3:22
Revelation 22:1-3
For what you have stated as truth to BE true, the separation of the expanse (angels and humans, according to you), would have had to have taken place right before the flood. For prior to that time, earthling man and angels were NOT separated, but co-existed. They were separated when the angels saw the 'daughters of men' and desired to remain IN THE FLESH in order to procreate with them. By this, they 'forsook' their 'proper dwelling place'... which was the spirit realm... AND the spirit body... for their desires in the physical realm... AND the physical body that they 'put on' in order to HAVE such relations.
The divisions in the 'water', however, took place even before earthling man had been created.
Genesis 1:2, 6, 26
Sorry, but I speak to you truth, just as I know and heard it FROM the Truth, my Lord, the Son of God, JAHESHUA MISCHAJAH (John 14:6).
I bid you peace,
A slave of Christ,
SJ