Relax.
I'm just speculating.
Taking the water to Neptune, our outer planet, along with "floaties" such as skeletons and floral debris could serve as a warning to angels not to repeat the events of Genesis 6.
And why should God go through what is frankly a hypothetical technological process (one which borders on science fiction) when creation exists entirely according to His will?
The Flood and the creation events have nothing to do with each other.
The Creation was in 4004 BC, and the Flood came centuries later, in 2348 BC.
God is omnipotent and created the universe ex nihlo.
Indeed.
In 4004 BC, God spoke the universe into existence through a series of miracles, done over a six day period that raised the level of mass/energy from zero to what it is today.
One miracle after another after another.
No science involved.
Christianity emphatically rejects the idea, promoted by Mormons, that God merely arranged and organized existing matter.
People need to learn the difference between creatio ex nihilo and creatio ex materia.
Here's a creationism test I once made up:
1. Define Embedded Age.
2. Explain the difference between creatio ex nihilo and creatio ex materia; and give two examples of each.
3. Why is "heaven" singular in Genesis 1, but plural in Genesis 2?
4. Eden in the Bible is known as __________ on a secular map.
5. Put the following in order that they appeared in the universe: whales, stars, trees, sun, land, sea, outer space.
6. What day was Adam created on?
7. Was the universe created a closed system and, if not, what kind of energy did it run off of? if it was created open, what closed it?
8. Describe terra aqua and what kind of water it consisted of and why.
9. Photosynthesis required light from the sun prior to the Fall. true or false?
10. Explain how a 24-hour day could transpire before the sun was created.
11. Explain the difference between "miracles" and "magic."
12. What literary device reconciles Genesis 1 and Genesis 2?
13. When discussing Creationism, why should one never let himself stray from Genesis 1 or 2?
14. What was the first object in the universe that had mass?