im not sure obout the ratios but 190 proof everclear is a bit over twice the
strength as most vodkas(80 proof mostly)so you should use a bit less than half
the amount of spirits you'd use on you're average screw driver, rum n' coke
7+7 and so on. you could try mixing a glass mesure it out and taste then do
the math.
i'd also recomend using a frozen concentrate fruiit punch for that cause it
has more body and the taste is fuller than koolaid plus it would cover the
alcohol better.