everclear is only 95% ethanol.
there are many routes to get it up over 99%. a notable one here is lime (calcium hydroxide) since it is easily obtained. i have not used this method, but i suppose one would pour lime into a jar of everclear, and shake it, let it settle, then decant. do this a few times, and filter. expect to lose some alcohol.
i have successfully used zeolites type 3a to go from 90 to 99+%.