The one most darkrp servers use it literally says on the pots? You need to buy the stuff it says on the pot to make red phosphorous, and then you make some iodine or whatever and mix that into another pot and cook it for however long and you get meth. If you can't follow a step-by-step video tutorial someone made of something already very self-explanatory you need to get your shit together, because something is not right with your slab of meat in your skull.