How to Grow Yeast. Two Methods: Growing Yeast from a Bread Starter Growing Brewer's Yeast Cultures. Yeast is a single-celled organism vital to most bakers and brewers all over the world, due to its ability to turn sugars into carbon dioxide and alcohol.You can create your own yeast-filled bread starter, or sourdough starter, with nothing more than flour, water, and regular maintenance.ow to Grow Yeast. Two Methods: Growing Yeast from a Bread Starter Growing Brewer's Yeast Cultures. Yeast is a single-celled organism vital to most bakers and brewers all over the world, due to its ability to turn sugars into carbon dioxide and alcohol.