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About 20 miles after putting gas in van ran rough sputters, bucks and dies. on 2002 GMC Safari

yesterday I put $25 worth of gas using a different pump than I usually use. After driving a little over 20 miles van started sputtering, bucking and trying to stall. Pulled over and put scanner on it (yes I carry a scanner) threw code P0300. Van was running fine before gas fill had driven about 15 miles before before stopping at station. Just passed the emission 3 weeks before. Suppected water in gas put Heet in tank and had van towed home. Plan on checking for water when it stops raining today. My question is what else could it be that van runs fine then like flipping switch starts to misfire.

Asked by for the 2002 GMC Safari
could be alot of issues scan live data and misfire data to determine cause
Where can I get the specs so I can compare the live data scan and what in particular do I need to look at?
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2 more answers
Use some de-natured alcohol to displace water, and it could be different things causing random misfires, but bad gas is a good suspect.
"Dry Gas" doesn't get rid of water in fuel, it simply goes into solution with it and makes it freeze at a lower temperature. The best approach is to forget about just fueling up for the moment and start troubleshooting the misfire like any other event. If the misfire is subsequently proven to be fuel related, then and only then do you get back to the other suspecions. Take note you said that it is raining, this easily could be just a basic ignition system issue and until you test and prove that in or out, anything else is just a guess.