I always like 99% Iso alcohol, I heat iso until boil and put small fan on container to move away moisture so it doesnt build up on inside walls of glass container. add product at boilingand make sure to disolve all of product, if it is not dissolving add a splash more iso until it does. remove from heat shortly after addition is complete. cover container with coffee filter+ rubber band to hold filter in place, set container in place with no foot traffic and have a fan in the distance blowing a nice weak breeze in the direction of the methjar.
depending on amount to recrystalize, i do this under 14 g. you should get nice crystals, it will take some time, save wait time on crystalization- Only use as much iso to dissolve all the meth. i like to heat to the point where solution is so saturated that as it cools you can see little baby crystals starting to dance...