Serious Eats: Recipes
Zombies are called zombies because they are seriously alcohol laden.
According to the original Zombie recipe, there are the equivalent of seven and a half ounces of alcohol in a just one Zombie. This would compare to drinking three and a half cocktails made with a healthy 2 ounces of booze for each drink.
I recommend you make the full amount and then divvy up between children's medicine syringes (available in drugstores) and allow guests to shoot themselves with the "antidote."