I most def use water, it makes it so the butter dont burn, I put my butter in the pan melt it, I than add my popcorn buds and sugar leafs (I use over 2 oz's pr lb of butter) than I pour in enough water to just keep it at the top of my mixture, I heat it into a slow roll (dont let it boil) than I turn it down to low on my slow cooker and let it simmer for upto 8 hrs, I would put mine up against any ones lol!
Butter is my fave now, I dont even bake with it, I put it on left over vegtables, potatoes, noodles, on an english muffin, I use it on all kinds of stuff, heat your stuff first than put your cannabutter on after, when I use noodles I always put cheese on it so it soaks up the butter and I dont waiste any.
I have also started to spice my butter with garlic, onions, chives, etc, since I dont bake with it I like to give it some flavor, I love it on my hash browns in the morning, My butter is pretty potent so before I eat my dose I get ready to start my day, after I eat i get up and go, if I dont I will sit in my lazy boy and chill all day lol! so be ready to start your day if you have things to do before you eat it, it will hit you and you will love what ever you are doing lol!
water is to keep it from burning the butter, I usualy have to add water to it during my 8 hr simmer! the longer you simmer it the more it dont taiste like cloriphil! and the more medicine you get out of it! just dont over heat it, I dont even use a thermometer, I have been doing it for a while, heck I do all kinds of chores and stuff while im simmering it, I just check on it now and than to make sure it is just simmering and dont cook to hot!
Peace