Now I am aware that kombucha is also a yeast fermented tea drink too; kombucha is actually what made me think about throwing some yeast into a pitcher of tea to start with. While both drinks do involve yeast and tea, YeasTea differs from kombucha because the kombucha culture is a symbiotic mass of multiple yeast strains and species of acetic acid bacteria, which results in the final drink having little to no alcohol (the bacteria gobble it up) but potentially all sorts of acids, and the YeasTea culture is nothing more than our good friend Saccharomyces cerevisiae, which (despite the fact that I'm using baker's yeast) results in a tea drink that's alcoholic but lacks (for the most part) the same variety of acids found in kombucha.
To make a yourself a batch of YeasTea you'll need the following:
A sanitary glass vessel that can be sealed (I use a boiled mason jar)
A wooden spoon
A candy thermometer
A kettle or other means to boil water
A measuring cup
A 1/2 end volume container to brew tea in (you could just brew the tea in the same glass vessel the drink will ferment in, but I find it easier to use a separate vessel)
1 tea bag/cup
1 tbsp sugar/cup
~1/8th tsp baker's yeast/4 cups
Step 1: Brew the Tea
Step 2: Hydrate Your Yeast (If You Need To)
I generally use around 1/8th of a tsp of yeast to make a 4 cup batch of YeasTea, and though I'm sure this volume of yeast will probably be good for larger or smaller batches assuming that the yeast only won't reproduce more than their environment can handle I'm just going to say to use around 1/8th of a tsp of baker's yeast per 4 cups just to be safe.
Step 3: Mix the Ingredients
Now add the sugar, stir it in with your chosen spoon, and seal the lid on your vessel
Step 4: Ferment!
Step 5: Enjoy!
As the second and third picture show, however, adding soy milk to YeasTea causes its fluid components to settle out. While I was a bit unnerved to see my drink do this, the fact that a concoction of vodka, soy milk, and soda I like to drink does a similar separation act makes me pretty sure that this is due to the presence of a minute amount of alcohol in my drink rather than some scary, inadvertently brewed up toxin. Furthermore, I think the fact that I'm still here to write this after drinking several batches solo should support the idea that it isn't poison.
On a final note, I hope it should go without saying that you shouldn't drink the layer of yeast cake at the bottom of the vessel; not only will pouring the yeast cake into your cup probably give your drink a strong, "yeastie" flavor, but in consuming the little guys you won't be able to reuse the yeasties left over to brew another batch of YeasTea.