The issue with using a concoction is thats 37% muriatic acid is 63% water. Being that hcl is 36g/m, a mole of hcl has about 63 ml of water, which will comandeer 63 grams of meth or up to 120g of cocaine. Using anhydrous methods eliminates having to recover that out of the solution. It's been done, but using the purest solvants reactants and reagents yeilds a larger amount of more pure drugs. If you're doing it in your moms basement, ok, but otherwise just do it somewhere not messy like you back porch, shed, lean-to, garage....make sure theres plenty of draft and control the reaction by using a drip funnel with a stop-cock and dripping the h²so⁴ into the hcl, not the other way around.