Commentary for Berakhot 104:19
ובה"א אם שמש תלמיד חכם הוא נוטל פירורין שיש בהן כזית ומניח פירורין שאין בהן כזית
But Bet Hillel say : If the attendant is a disciple of the wise, he takes those pieces of bread which are of the size of an olive and leaves the pieces which are less than that size.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Consequently there is no need to fear that bread will be spoilt by the water, since the crumbs do not count.
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