@tsarstepan,
Gads, you're living the high life! Never ever ever adulterate really good bourbon, whisky, whiskey, or scotch. Well, for those who don't want their gullets reamed out with strong drink, soda or water or ice will suffice, best on the side but understandable in the drink.
In my case, I doctor bad booze with chocolate milk, as I'll describe, and bad wine with fruit juice, for Fools' Sangria.
For Milk Gone Bad, my view of it is to take a standard highball glass and add 1/2" booze on hand, stuff the glass with very icey ice cubes, and top with so called 1% chocolate milk or chocolate soy milk. This is very un-european, as they rightly assume that best flavor is found at temperatures neither too hot nor too cold... but best flavor of bad booze is an unlikely outcome by definition.
Highball glasses are apt to be hard to find now that the trend is toward ever larger beverage containers. Thrift stores are a good place to find them at excellent pricing.