Ideally you want to smother the alcohol fire and not use a liquid. Dliute alcohols will still burn. Water will spread it much like a grease fire. Carbon dioxide SHOULD be able to do it and I don’t know why they don’t use CO2 foam...oh wait...nevermind...I’ll crawl back into my hole and continue to burn gasoline and diesel.
Hydrogen fires are nasty, too. Having worked in manned-space flight for the first 10 years of my career, I can tell you that you really don’t want to have to deal with the stuff. Burns with almost no flame showing - when you see photos of the Hindeberg, what flames you see are the skin of the airship.
You should inform the Indy Racing League. One of the reasons they have adopted ethanol as their fuel is for safety reasons. Sceptics may review the Eddie Sachs crash film.