Related for Pesachim 83:8
אמר רב יהודה אשה לא תלוש אלא במים שלנו
there it means that it is not abundant, so that it does not collect. Rab Judah said: A woman must knead [unleavened bread] only with water which was kept overnight.<span class="x" onmousemove="('comment',' Because in Nisan the water in the wells is warm (v. infra 94b) . which hastens fermentation. Therefore it must be drawn the evening before it is required, so that it can cool off.');"><sup>10</sup></span>
Tosefta Pesachim
Water that was used by bakers may be poured out in a level place, but it may not be poured out in a place with a downward slope (קטפרוס) because it gathers together and becomes leavened.
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