X2 If you wanna go fast, it's going to take some time. It'd be nice if there was something more simple, but alas, between the lot of us, we might be able to figure something out.the filter setup i found has dual inlets and outlets. you can have a pressure transducer at either the rail or at the regulator. have a gauge at the filter in the second port and see what the pressure difference is. when you see a 5psi (maybe 7-8) difference in pressure its time to change. Yes there is ways to do it that are simple but you need to say on top of it. also if the car sits for a extended period of time, and you had a plug or drain at the low point in the tank you can drain the water before you start the car.
it might be nice to have a filter that you don't have to change as much but yet the quality of filtration is not as good neither is the quality of fuel being injected into the motor.
just my .02 of course.