The process is elaborate, expensive and extremely time consuming. If you are super handy you could build your own still for distillation so that might save you a few bucks but the lab quality equipment will be thousands. And since we're talking about something you plan to aspirate, any setting less than a controlled environment is more than a little risky. I looked at the process some time ago and found that $3.50 for a bottle of pre-made extract is waaaay cheaper and much safer. It may not always be perfect but I honestly believe that more flavorings are in the works from many different suppliers.