From wrestling, after testing body weight, fat %, and hydration, they only let us lose 2 pounds a week. Of course, this wasn't always followed, but you're not going to lose more than a solid 2 pounds per week.
Water weight isn't real weight. Plus, there's the quote around here, "Chase performance and composition will follow."
Look up what a pound is and how it was defined and you might throw your scale away.