I've never gotten the feeling that the Nazgul DID fear water. They didn't follow the hobbits across the Brandywine at the ferry because it was too deep for their horses to swim. And they were perfectly willing to cross at the Ford of Bruinen; it was only the Guardian of the Ford that defeated them.
That is the reason some held back and had to be driven into the Bruinen by the rear attack of Glorfindel. They knew their horses would die in the rocks and waves. But Glorfindel in all his "First Born" glory scared them and drove their horses into a panic, so they dived blindly into the water to be swept away.
I think it might have been the same with Aragorn. They feared the light of his spirit more than the torch he was carrying.
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