Storing potato water: how long can it be refrigerated? When boiling potatoes, I like to use the leftover water for soups, sauces, etc. Does anyone else use potato water, and if so, how long can it be stored in the refrigerator? I am wondering if it has a "shelf life" similar to homemade stock.
Yes, shelf life would be similar to homemade stock. It has the same potential for cross-contamination, and natural contamination (with a slightly reduced chance for contaminates from ingredients, as there is no meat).

Be sure to cool and refrigerate quickly (cool pot in a sink of ice + cold water). If left to sit out, warm + starchy water is a great breeding ground for un-fun microbial life.