Any air in the system will contain some water vapor, I don't believe you will get rid of it.
The Kansas City area has had ethanol in fuel so long I don't remember when it didn't. It doesn't seem to be hurting much on my truck and it will set for months with the same fuel in the tank. I bet right now it has fuel from last October or November, Quick-Trip 87 octane with 10% or more ethanol. Started right up last week and ran just fine. Maybe the sealed gas cap helps? The carburetors dry out pretty quickly, but they still have the same gaskets I started with four or five years ago.
