>>417015826don't have the how to but i actually did it so that works to.
First make sure you get the right cough med, it will say in the ingredients dextr.... Polistrix, do not get the Hbr one you can't cold water extract that.
Delysum is the one that works the best
the way they said to do it
>use a milk jug that has been cleaned>fill with water >dump cough med inside >wait 2 hours or a little more (some say 3-4)>powder will be at the bottom the only hard part is getting the powder with out losing most of it.
I poured as much of it off without losing to much powder then used a coffee filter for the rest, then i wait a day for it to dry out.