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The old remedy was to add some "denatured alcohol", also called methylated spirits - from memory about ½ a cup to a gallon. Only did it once to some mower fuel which had been in the tin for 9 months - worked fine, but my mower wasn't fussy, an ancient B&S engine.

 

What do the folks in the great white North do in the winter? Gas line freeze up has to be a problem.Save for the damp burn piles to get them going. Just throw a wad of paper from a distance and wear a face shield. Cup of gas will do it. Works for me. But 10 gals is too much. maybe a lawn mower but this stuff is bad on a carburetor.

 

This has been a problem for boats for some time. Take a look at this link, it has very practical advice.

Marine Problems with E10 Ethanol Fuel Blends.

It is hard to make gas - ethanol, because ethanol will suck the moisture from the air.
Here is a link for making pure (water free) ethanol.

Home Distillation of Alcohol (Homemade Alcohol to Drink)

As you see, it ain't easy.

 

Benefit is you can drink it.

 

If you want to drink it and happen to work in a lab, it is rather easy actually. Whenever we threw a big party, we used to make gin in the lab:
(1) get slips from the Profs to get gallons of 95% non-denatured ethanol from the stockroom (100% may contain traces of things used to remove the last 5% of water) - the 95% from the stockroom had an edge to it, it was far smoother to drink after we distilled it - and yes we used the 95% for research as well, which is why it couldn't contain denaturants
(2) dilute to 50% with distilled water
(3) add juniper berries (amount determines how gin-y the product will be)
(4) distill (before anybody gets excited, we had a special glass still we used ONLY for this purpose, and yes it was in a hood)
(5) when the original volume of 95% has collected in the receiving flask, stop (leaving brown liquid in the boiling flask)
What you have is 190 proof (95% alcohol) gin. Too strong to drink so we'd cut it back to about 50% with distilled water.

We'd "borrow" some massive stainless Waring blenders from the lab (not used for anything harmful, and we cleaned them thoroughly), blend with shaved ice from the lab (from an ice machine running off distilled water) and lime juice concentrate, and, voila, lime daiquiris! Pour into a glass carboy (also "borrowed" from the lab and thoroughly cleaned), and serve. Best results if the gin were stored in the freezer beforehand (it didn't freeze).

Made big parties much cheaper because all we paid for was juniper berries and lime concentrate (and beer kegs, wine, and snacks).

For fuel purposes one wants water-free alcohol which is much more involved.