[Rudder]

Ethanol contains water that distillation cannot remove.

Ethanol is hydroscopic and, even if one could temporarily remove all water, it absorbs water from the surrounding atmosphere.

[neverdem]

Ethanol is hydroscopic and, even if one could temporarily remove all water, it absorbs water from the surrounding atmosphere.

The word you want is hygroscopic, from Greek meaning it absorbs moisture.

[dennisw]

hygroscopic

[Unassuaged]

In fact, I remember adding little bottles of ethanol to my gas tank in super cold IL to remove water from the gas.