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Frequently Asked Questions Summary Category What's the best bottled water to drink? Bottled Water Are cookware products with coatings safe to use? Kitchen Products What is the difference between an NSF Certified hot dog cart and one that is not? Kitchen Products What does NSF certification of home water treatment systems cover? Drinking Water How long can foods be safely left out of the refrigerator? Food Safety To what temperature do I need to reheat foods so that they are safe to eat? Food Safety Does the #7 on the bottle mean the bottled water is unsafe to drink? Bottled Water Why should I purchase NSF Certified supplements? Dietary Supplements Will putting hot leftovers in a refrigerator compromise the safety of the foods already in there? Food Safety I've read that it isn't safe to cook stuffing inside a turkey. Is that true? Food Safety