It seems to me that the most reliable information that we have is through "Witchcraft Herbal Lore and Flying Ointments" (look it up) or its sister site http://witches.monstrous.com/witchcraft_herbal_lore_.htm

The only difference between the two is that the latter leaves out one plant from the former, namely Woody Nightshade (solamum Dulcamara).  The document does not give preparation information, but makes it clear that the given ingredients have been tried successfully by someone "known to the author."  If you have come as far as reading this, however, then this all will probably be familiar to you.