One thing that is worth noting is prior to commencing a preflight check it can be worth giving the wing or aircraft a reasonably firm wiggle to redistribute any water, hopefully to a drain point (make sure you give a reasonable time to settle).
That is the one thing I have been told NEVER to do, and to check the fuel PRIOR to moving the aeroplane.....The drain points should be at the lowest points of the fuel system so any water collects there. Now, I know you said leave enough time for it to re-settle??
Regards, SD..