Hi again Mary. If you're looking to follow our method for building up a sourdough starter, you'll want to start with whole wheat or pumpernickel and switch to all-purpose for the first official "feeding" on Day 2. You can read our step by step instructions here: http://bit.ly/1JOgr6L. While we especially love our Sourdough Crock (http://bit.ly/1z85BSI) for storage, glass, crockery, stainless steel, or food-grade plastic all work equally well. Sourdough can be tricky, so if you have additional questions, please give our free Baker's Hotline a call at 855-371-BAKE. Our bakers are here seven days a week and happy to help! Mollie@KAF

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