I guess it could have been a Nazgul but the way Tolkien describes it as a "black Bundle" and "crouching to the ground, swaying this way and that", It just resembles Gollum, to me, more then the way the Nazgul behave. Maybe Gollum did follow them in the water or he went around. I don't think Gollum was able to travel through the water as deep as the Brandywine and there wasn't another ferry boat. Gollum even used a boat in his cave back when Bilbo found the ring. He was not afraid of the water but I think he was still capable of drowning. Anyway, I guess the "black bundle" could be Gollum or a Nazgul, or whatever the reader decides to accept it as.
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