Sforno on Deuteronomy 12:24/ספורנו על דברים י״ב:כ״ד

1לא תאכלנו, על הארץ תשפכנו כמים, you are to treat it so that it becomes unfit to eat, just as is water when you pour it on the earth. It is not enough to hide it, as one hides wine or oil and other liquids which are designed as drinks.