Where's this water coming from?
I agree with Ed Beal. But, the culprit should be the bathroom. Lay paper towels (select-a-size) or a strip of toilet paper along the bath's adjoining wall to see if it gets wet anywhere.

I suspect it's coming from the toilet's seal at the floor &amp; that seal needs replacement, they can leak a clear water stream &amp; not be noticed. It could also be traveling under the finished floor, thus why it's depositing outside of the bathroom.