Yeah mate just google canabutter. You need to activate it, so under 115C and over 110C for 30-50 mins, ground up (you can see it on the oven tray in one of the pics).
Then you need to keep the temp below 250F in the saucepan apparently and that is what the water does. Strain through a cloth and refrigerate. Tip out the water from under the set butter.
I choose packet mixes that are rich in butter, this ones 150gm, but i couldn't do my homemade gooey choc chip cookie recipe, it takes 250gm, you'd only need half a cookie.
UnllesYou'reTommyChongPunkin
Note; obviously you can't do this if you have kids at home. Freezer full of yummy slice and a slight distraction could be the worst moment of your life.