I would run a little bit of Isopropyl alcohol in the fuel. This is used to drive out moisture. It is used in the snowmobil all the time for that reason. 2-3 onces in the tank (full tank) at most though.
I would also Indyred,s advice as well.
HEET gas line antifreeze and moisture remover comes in a 12 oz bottle - it is claimed to treat 20 gallons of gas - HEET is primarily methanol alcohol and other undisclosed additives. 12 ounces added to 20 gallons of gasoline results in an approximate .8% mixture of alcohol and gasoline.
If your fuel already has a 10% blend of alcohol, what does increasing the alcohol content by .8% do? If you are using alcohol free fuel, how much water can .8% of alcohol absorb? How much water can be added to alcohol before alcohol will not burn?
If you mix alcohol and water then heat the water, the alcohol will be evaporated before the water and can be burned as it escapes the water leaving behind pure water. Alcohol boils at 173 degrees F while water boils at 212 degrees F.
Alcohol blended fuel can absorb appx. 1 tablespoon of water per gallon of gasoline, but the water will cause the alcohol to separate from the fuel and settle on the bottom of the fuel tank. Adding an additional .8% of alcohol will only increase the alcohol content of the water. I suppose at some point, with enough alcohol added to water, you would be able to run your engine on alcohol/water fuel, but calibration of the fuel system would be a nightmare.
Best thing to do is remove the fuel tank, dry it completely by flushing with denatured alcohol (available at most hardware and paint stores) and allowing the alcohol to evaporate before refilling the tank. Then fill with non alcohol fuel and no additives. Best additive to prevent fuel system problems? Two stroke oil - about a 1.25 oz (or 7 teaspoons) of oil to a gallon of non ethanol gas (oil does not mix with alcohol) - the oil will coat the internal parts preventing corrosion and reducing condensation on the metal parts.
Since you system is fuel injection, the ECU will take some time to adjust to the change in fuel. It tried to compensate for the water, it will now have to readjust for the non contaminated fuel. It will take several restarts and runs to readjust completely.