STOP! STOP! STOP!
Fuel that badly contaminated will take out the HPFP in a CR TDI in no time at all.
Fortunately your Mk4 TDI has a more robust fuel system but it will send your injector pump to an early grave. A single tank of bad fuel like what you have is all it takes.
Drain that fuel outa there ASAP before doing anything else and replace it with fresh fuel from a high turnover station. Put a biocide thru it as recommended and be prepared to do several FF changes to catch all the dead critters in the fuel.
Not shouting but CHANGE WHERE YOU FUEL UP!
A single tank of water contaminated fuel like what you have is all it takes to do a lot of injector pump damage in a short amount of time. Fuel up ONLY at high diesel volume / high diesel turnover stations to get only the freshest fuel in your area. Busy truck stops along major routes are best due to the heavy truck traffic. Go where the big rigs go. The fuel is the freshest in the region and will be the least likely to be contaminated with water from condensation and algae growth due to water. Diesel fuel is hygroscopic like brake fluid is and likes to soak up moisture like a sponge. Avoiding water is most important during winter months where condensation is more of a problem. It is not uncommon for a busy truck stop along a major route to do more than $30k worth of diesel business in a single day.
My favorite busy truck stop I fuel up at in NH gets 10,000 gallons of diesel fuel delivered every day to keep from running out. They have multiple tanks and have about a 2-3 day supply. An entire tanker truck (10,000 gallons) gets emptied there every day just to keep up with demand to keep from running out. No worries about water at this station because the fuel is constantly being replaced. And if there should ever be a problem with their fuel it will be caught and corrected VERY quickly before a lot of diesel vehicles get damaged.
I have a gas station 0.6 miles from home that has diesel but I purposely DO NOT fuel up there. The station does not get much diesel business because it is not designed to handle big rig truck traffic. They can't get in there and it is always mobbed by gassers. I get a few gallons of gasoline there once in a while for my lawnmower and snowblower. I would rather drive 25 miles to my favorite truck stop instead of fueling up there. Not worth the risk IMHO. While plenty of stations around me have diesel, only a few of them in the area have made it onto my list of trusted fuel sources.
No water in diesel fuel means no algae growth and ensures long and reliable service from the injector pump and injectors.
Good luck.