LoL you dont buy it mixed. First on your shoppin list for sizzurp is;
Alcohol - Vodka usually, Pop - Sprit most common, T3s -like 2-3 of em, them finally some Cough syrup - usually Robotussin Max Strenght Cough.

It tastes SOO unbelivebly horrible. But if you can put a class down, it will put you down thats for sure. Its a real wierd expiriance. Its real popular in places like Huston, Texas.