What you're saying makes entirely no sense. It absolutely matters what ingredients you have, don't be daft. If a potion calls for boomslang skin, I'm hardly going to replace it with fairy wings and just hope it'll turn out okay! I'm not trying to create new potions, I hoping to make potions that I already know exist and work. We haven't the time or resources to experiment here, this isn't a potions research lab. For Merlin's sake.

And no. No, many of the things I need can't be found here. I'll have to ask Miss Margie.