Write an article based on this "Buy a small packet of dry yeast. Put the yeast in water of about 30 °C (86 °F). Add sugar to the yeast and water and keep the mix at between 30–38 °C (86–100 °F). Keep feeding sugar to the yeast and it will continue to grow. Make sure to feed your yeast every time you bake with it, and if you bake infrequently, feed it at least once a week."

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Take out the yeast you intend to use for baking and add enough warm water and sugar to bring the starter back up to its former volume.