Yeast is a living microorganism, so it is not typically “made” from scratch at home
To obtain yeast, purchase active dry yeast, instant yeast, or fresh yeast from a store
To multiply yeast for use, mix warm water, sugar, and a small amount of yeast in a clean container
Keep the mixture in a warm place until it becomes foamy and active
To maintain yeast for future use, feed it regularly with flour and water if using a sourdough starter
Store yeast in an airtight container in the refrigerator or freezer to extend shelf life
Discard yeast if it shows mold, off odors, or unusual discoloration