^^Don't do it... its a retarded method of extraction, and its not the easiest one out there...

If you want pure DXM powder, then buy 3 boxes of sucrets DM, and follow this method (3 boxes will make 810mg of dxm powder)
http://www.dextroverse.org/txt/sucretextract1.txt
All you need for this method is
-a glass jar
-water
-sucrets
-turkey baster(to siphon remaining sugar, and dyes from the DXM powder which fall to the bottom of the jar)
-microwave(stir concoction with 1 minute intervals)