Making brewery yeast from scratch using fermented fruit is possible, but results can be unpredictable. Fermenting fruits like grapes and apples can introduce natural yeasts suitable for brewing. Some home brewers have successfully used dried fruits, such as sultanas, to cultivate yeast for beverages like ginger beer. However, for high ethanol production, the yeast typically used for baking may not be effective due to its low sugar tolerance.The discussion highlights concerns about the potential dangers of producing methanol alongside ethanol during fermentation, especially in DIY alcohol projects. While the idea of using fruit waste for ethanol production is appealing due to environmental considerations, it is noted that such endeavors may require commercial-scale operations and proper distillation techniques. The conversation suggests exploring alternative uses for fruit waste, such as biogas production or composting, as more feasible options. Overall, while home yeast cultivation is feasible, the complexities of high-yield ethanol production necessitate careful planning and research.