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Here's a step-by-step guide on how to make your own Kombucha:

Ingredients

A kombucha "mushroom" mother, also called a SCOBY, for Symbiotic Culture of Bacteria and Yeast (and sometimes referred to as "culture" in this article). You can get a kombucha "mushroom" at many different places on the Internet. Or if you're lucky, from a friend who has an extra! Once you have a mother, you will never need to buy/obtain another if you take simple steps to preserve old mothers.

A sample of already made Kombucha as a starter, or brewed vinegar if you don't have that.

Tea. Tea bags or loose leaf teas will work. Sometimes common, low-grade teas will end up tasting better than expensive teas. Teas containing oils, like bergamot oils in Earl Grey, can harm your mushroom, meaning significantly longer brewing times for satisfactory results. Many teas will work: Green, Black, Echinacea, Lemon balm.

Sugar sources. Regular refined white sugar or organic cane sugar works fine. You can experiment with other fermentables, like juice reconstituted with tea. Many brewers prefer organic, if available. Ribena, for example, colors mushrooms and tea.

Step by step

Part 1 -- Brewing the tea

Wash your hands very well with hot water, do not use antibacterial soap as this can contaminate the Kombucha and destroy the good bacteria provided by the culture. Using apple cider vinegar or plain vinegar to wash hands and any other materials you will be using is a good substitute for antibacterial soaps. Use of non-latex gloves is also recommended, especially if touching the culture directly.

Fill up your pot with three quarts of water and heat the stove to high. Boil water for at least five minutes to purify it. Add about five tea bags to the hot water. According to taste, you may remove tea immediately after brewing, or leave them in for the next two steps. Turn off heat and add one cup sugar. The culture will feed on the sugar, making it a necessary part of the fermentation process. 

Cover and let the tea sit until it is room temperature. It will seem to take a long time to cool, but adding the culture when the water is too hot will kill it.

Part 2 -- Adding the Culture

Wash a glass jar well in the sink with very hot water, rinsing thoroughly. 

When the tea is cool, pour it into the glass jar and add the starter tea, which should constitute about 10 percent of the liquid. Using about a 1/4 cup of vinegar per gallon of tea also works. This keeps the pH low to prevent any foreign molds or yeast from growing while the tea is getting started.

To make sure it's acidic enough, measure the pH (optional). It should be below 4.6 pH. If not, keep adding starter tea, vinegar or citric acid (not Vitamin C; that's too weak) until the desired pH is reached.

Gently put the SCOBY into the tea, cover the top of the jar with the cloth, and secure it tightly with a rubber band.

Put the jar somewhere warm and dark where it won't be disturbed. (A cupboard above the refrigerator works well). The temperature should be consistently at least 70 degrees. 86 degrees is best if you can manage. Lower temperatures will make it grow slowly, but below 70 degrees makes it more likely that unwanted organisms will start growing too.

Wait about a week. When the tea starts to get smelly like vinegar, you can start tasting it and checking pH levels. The culture will sink or float or do something in between. It is better that the mushroom floats on top to block contamination.

The best way to pull a sample is with a straw. Don't drink directly from the straw, as backwash may contaminate the tea. Also, do not dip the test strip into the brewing vessel. Instead, dip the straw about halfway into the tea, cover the end with your finger, pull the straw out and drink the liquid inside or put that liquid on the test strip. If the kombucha tastes very sweet, it probably needs more time for the culture to consume the sugar. A pH of three tells you that the brewing cycle is complete and the tea is at the correct point to drink. Of course, this can vary a bit to suit your needs and taste. If this final pH is too high, then either the tea will need a few more days to complete the brewing cycle, or it should be chucked.

Part 3 -- Bottling 

Gently remove mother and baby cultures with clean hands (and non-latex gloves if you have them) and set them in a clean bowl. Note that they may be stuck together. Pour a little of the kombucha on them and cover the bowl to keep them protected.

Using a funnel, pour most of your finished tea into storage containers. Optionally, fill it all the way to the top. If you do not, then it will take forever to get fizzy. If there isn't enough, you can either get smaller containers. Or, if there's just a slight gap, fill the rest with juice or more tea. Use only a small amount, or else you risk watering down the tea. Leave about 10 percent of old tea in the glass jar as starter tea to start a new batch of kombucha.

Begin the cycle again: Pour in freshly brewed tea, put the culture back in, cover, etc. You may use each layer of culture to make a new batch of tea; some recommend using the new layer of culture and discarding the old one. It is not necessary to put both layers of culture back into a single new batch; one will suffice. Every fermentation cycle creates a new child from the mother. So once you have fermented your first batch you will now have two mothers, one from the original mother, and one from the new child. This multiplication will occur for every subsequent fermentation.

Cap your jug or bottles of finished kombucha. Cap them loosely for safety, tightly for carbonation and let sit for about two to five days at room temperature.

Refrigerate. Kombucha is best enjoyed cold.

-- Source: Wikihow.com

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