They may or may not list all the ingredients on the box. I've never actually gone through the process, but I've read quite a bit about it, so take my response accordingly -- but to the best of my knowledge, you can't always trust the box.If you extract with water you're going to be waiting fucking forever for the shit to evaporate though. I recommend something else. There was a stunningly effective method... it might have been by Geezmeister or Worlock, I don't really remember. I decided not to cook after studying it for awhile -- only wanted to supply myself anyway, and I'd rather just buy the stuff frankly -- so it's been a long time. Was a procedure involving acetone, naphtha, and xylene I think... no soaking or anything. Well, whatever.My advice is basically don't use water, it'll take forever to evaporate. Also, you want the cleanest p-fed you can get. It's worth the trouble getting it as pure as possible -- total failure is a lot easier to run into than the media would have you believe.