Commentary for Avodah Zarah 93:19
לעולם למיא קא סגיד והכי קמבעיא ליה למיא דקמיה קא סגיד וקמאי קמאי אזדו או דלמא לדברונא דמיא קא סגיד
Rather we assume that he worshipped the water; and this is the point of his question: Did he worship the water which was in front of him and that water has flowed away, or perhaps he worshipped the flow of the water?
Daf Shevui to Avodah Zarah
The question is whether he was worshipping just the water that is in front of him. That water has already flowed away and therefore any water subsequently drawn was not actually worshipped. Or was he worshipping the flow, meaning all of the water? If so, it would be prohibited to use the water from the stream.
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