HERE IT IS:
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All except the Witch-king were apt to stray when alone in daylight; and all, again save the Witch-king, feared water, and were unwilling, except in dire need, to enter it or cross streams unless dryshod by a bridge.
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The footnote appended to this quote reads:
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At the Ford of Bruinen only the Witch-king and two others, with the lure of the Ring straight before them, had dared to enter the river; the others were driven into it by Glorfindel and Aragorn.
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And more....
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[Sauron] had these two additional objects: to capture or kill Gollum, or at least to deprive his enemies of him; and the force the passage of the bridge of Osgiliath, so that the Nazgűl could cross, while testing the strength of Gondor.
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Immediately after this Christopher Tolkien writes:
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My father nowhere explained the Ringwraiths' fear of water.....it was said that "[Khaműl] was well aware that the Ring had crossed the [Brandywine]; but the river was a barrier to his sense of its movement," and that the Nazgűl would not touch the "Elvish" waters of Baranduin. But it is not made clear how they crossed other rivers that lay in their path, such as the Greyflood, where there was only "a dangerous ford formed by the ruins of the bridge". My father did indeed note that the idea was difficult to sustain.
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I haven't been able to find anything about the effects of Fire on the Nazgűl, but if I do, I'll be sure to post it.