Water in fuel light came on then off

I've owned my RV diesel for 24 years now, and the one and only time the "water in fuel" light came on was after I refilled the tank during a heavy wind-and-rain event under a canopy. A few miles down road the warning light flashed on and off a few times, but I kept driving until the rain stopped and I was able to pull over. I drained the fuel filter bowl of a few ounces of fuel. I don't know how much water it might have had in it, but that light never came on again. So whatever water I picked up, it was not enough to cause me real problems.