There should be a petcock valve on the bottom of the filter which should allow you to drain the water out of the system. Most have a clear bowl on the bottom which should allow you to see the water, if in the system.
Don't totally drain the filter, as you are probably draining out perfectly good fuel.
Also, be sure to drive the coach after draining before putting away for the winter. This way, everything should be primed and ready to go for spring.
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX