Its slightly more complex than just evaporating the alcohol due to the intricacies of physics and a thing called an azeotrope. As already mentioned, the device used to safely concentrate alcohol is called a still. They do not need to be complex but must have at least a couple attributes:
A vessel in which to gently boil the liquid that has an outlet that feeds a condenser to return the vapour back into a liquid.
There is something called a conical or wok still. It is a pot to put your low alcohol liquid in, a stainless bowl that will float inside to pot without drifting too far off Centre and a larger round bottom bowl or wok that will act as a cover for the pot. You put ice in the large bowl or wok and the concentrated alcohol collects in the smaller one floating inside. Needs to perked in upon periodically to prevent overfilling and sinking the small bowl. Do not try this on a gas range, electric only.
I was in my local Lowes hardware store yesterday and they had plenty of the alcohol used for stoves.
It is potent enough to use as a cleaner and sanitizer.
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is this what you guys are looking for?
Build a Wood-Burning Alcohol Fuel Still - DIY - MOTHER EARTH NEWS
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