If you were asking about the flu virus living in a large body of water like a lake or a city water system, no, that is not a vector.
3-7-06
"Germany reports TWO more cats killed by bird flu"
Brelin(AFX)- "Two more cats have died of the H5N1 bird flu virus, the agricultural ministry announced."
http://www.forbes.com/home/feeds/afx/2006/03/07/afx2577739.html
FYI