I had the Water in the fuel light come on. This was out in the middle of nowhere with no extra filter on hand. (now I have a set at all times) and all I did was crawl under the back, opened the tiny valve, let out the fuel until the murky stuff turned into clear fuel, and closed the valve. did the same on the front for about 20 seconds even though it all came out clear. The water in the fuel light went away, and everything was back to normal. just did the fuel filters today, and they still looked decent with 15k miles on them. I usually do them every 12k, but was on a run and couldn't get a hold of the rear, newer style cartridge filter. had to order it on amazon (cheaper anyways). so I ran a bit over. Not too bad anyhow, as I add Hotshot EDT every fill up.
I'll attach pictures of the front and back filters new vs. 15k miles so you guys have a comparison and see how yours holds up. I almost always fill up at truck stops all over the country, add additive and get DEF from the pumps only. Hotshot EDT every fill up.