Methyl alcohol always bonds with water (technically, it is aquaphillic) and the bonded water/alcohol is transported through the engine with the fuel system. If there is too much water, it can freeze and block the fuel delivery system.
The problem is more likely to be gunk in the bottom of the tank getting sucked into the fuel system.
As you were told before, put a few bottles of Methyl alcohol (HEET, Fuel dryer, whatever you call it) in the tank, run it until almost empty, refuel and put one bottle in and run it out. Then change the fuel filter.
Depending on the environment where you live, moisture may or may not condense in the station tank (or truck tank) from the air moisture.
A while back, a small station owner in my area was CAUGHT ON HIS OWN SECURITY CAMERAS adding water to his underground fuel tank for his station. He paid for repairs on a few cars and paid a fine. Later, after the story became widely known, he went bankrupt.
Small amounts of water in fuel is not usually a problem, but larger amounts can cause problems.
