You have in your hands a kit for growing "Kombucha". But in reality this is not a mushroom, but a complex community of microorganisms: yeast and bacteria. They live together in the form of a thick film. Yeast turns sugar into alcohol, and bacteria turns alcohol into vinegar. As a result, everyone is well, such mutual assistance is called symbiosis. When you feed it with sugar, the yeast from the community makes alcohol out of sugar, from which acetic acid bacteria then make vinegar.