Ive never added water to my butter. ive also never had anyone tell me how to do this before, all i new was that it was butter and weed, then u bake or do what u want with it. so ive always gotten a quarter and two sticks of butter. i melt the butter down as slow as possible. then i gring my weed in a coffee gringer. when the butter is all liquid i add weed. raise the temp. slightly for a very low simmer. I do it for about 10-15 min. to try and get rid of the slight amount of water in butter already. When i researched vaporizers I believe the temp was 225 that thc is released and thats how it worked. so to me simmering for 5 hrs. is not necessary. just reaching the right temp. to release the thc is(which ever it may be). Im no professional or scientist but all i can say is, is when i make butter i get hammered bro.