Here is a link with instructions on how to grow your own scoby. I did it this way, and three years later, I'm still brewing.Starting it off would be good because I have no idea where to get this scoby.
https://www.thekitchn.com/how-to-make-your-own-kombucha-scoby-cooking-lessons-from-the-kitchn-202596
There are a lot of good sites with info on brewing kombucha. I can make my own for under a dollar a bottle. Probably closer to half that.
If you have questions, just ask. I can't say I'm an expert, but I will share what I've learned.
. I'm about to look into your link.