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Once Tofu has been opened, how long is it safe in the refrigerator?
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From here HGOF - Organics 101: Food Storage TipsTofu: Once you have opened a package of tofu, you should store the unused portion in a container of water, with a tight fitting lid. Tofu should be used within three days from when you first open the package. The water should be changed daily.
If I discarded tofu a week after opening, I'd throw out more than I eat. YMMV, but I have frequently cooked and eaten tofu two weeks or more after opening the package (and the package might well have been sitting in the refrigerator for a while before I opened it, too). I didn't put a lid on the container, I didn't change the water daily, and I experienced no ill effects of any kind.Once opened, less than a week. You can extend the freshness by putting the tofu in another container (with a lid) and changing the water (enough water to cover the whole tofu) every day.