Wow. Well that would do it, and also explains the original reason the engine ran for a little while then stalled. That's out of left field. I still say you could have come to the diagnosis of "bad fuel" much more quickly and with less frustration if you had followed a step-by-step logical diagnostic process ruling other possibilities out. Just a tip for the future, and it would have left an easier to follow chain of troubleshooting information here for others to potentially find and make use of later. But either way it's good to hear you got it figured out, assuming you are sure this was it.
So, did you get the water all out of the tank, or hook up an alternate known good fuel source, and now it starts and runs just like normal again??
How did you figure out that was the issue? The process here, now that you have found a solution, is to close out your thread with details on how you succeeded, so that someone else finding this later on will understand the steps you went through and possibly get their own benefit out of it. This is the small favor you return for all the *free* time and advice others gave you.
It's a way for this conversation to help not only you, but others too.
Have you replaced the fuel filter yet? You probably should, knowing there has been water in the tank, since it likely has much moisture and corrosion inside now if so.