As long as you are buying good fuel, you will not have any water in the fuel/water separator. I think you may also be able to see the water and fuel (fuel will float) in the bowl, if you needed to drain it. I rarely check mine anymore as I have never found any water in the fuel issues.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7