You can't just make the syrup, but once you got the codeine with promethazine cough syrup, put it in some sprite in a styrofoam cup with ice (its extra good if its ice and a cup from sonic) and a jolly rancher (optional) and then get ready to lean.
i got a site from new zealand that you can buy promethazine and codeine pills, then u could crush em up n dissolve em in a syrupy mixture, but i cant garuntee the shit is gonna make it past customs.
You can buy the shit on the streets like you can buy weed. My homie got a connect on the shit down in Texas. Thas where i get my lean. Summer time boy, Time for a road trip and stock up on some lean. Get the lean, Mix it with sprite and jolly ranchers fool. Get ready to LEAN back.
I have had Robatussin w/ Codeine which got me real f'd up...when people talked it sounded chopped & screwed like the music