Like all Spider-Man villains, Morris blames the Wall-Crawler for his transformation and swears vengeance.
The best way to think about him is that he has literally the same powers as Sandman, but with water.
The energy from the generator mixed with the ocean gave Morris the ability to become and manipulate water.
However, he was thrown overboard during a battle between Spider-Man and Namor the Submariner while an experimental generator was being tested in the ocean.