You will need a Kombucha Culture Starter to brew your own Kombucha Tea.
My family and I have been brewing Kombucha tea for many years and I personally believe that to brew Kombucha tea, you only need a small piece of kombucha culture starter along with more of the mother liquid, as the mother liquid is more important. This is why I originally only packaged my kombucha culture starter kits with a small piece of culture, so I could fit as much of the mother liquid in the package, ensuring a good brew. These starter kits which will make a 2L brew of Kombucha Tea are still available on this site and can be found here. I personally believe these kits are the best value for money of all the kits.
If you prefer to make a larger brew, I have a kombucha culture starter kit with a round scoby and enough mother liquid to make a 4L brew of Kombucha Tea.
For those of you who would like to ferment a larger 8L brew I also have an 8L starter kit.
Continuous brews of Kombucha Tea
In my years of brewing Kombucha Tea, I have found that using the continuous brew method produces a much nicer tasting and fizzier drink. I use the continuous brew method for my ready made bottled kombucha tea.