Storing tofu in flavored water is not a reliable method for preservation and can potentially lead to bacterial growth and spoilage. It's best to store tofu in plain, fresh water, changing it daily, or use other proper preservation methods.
While storing tofu in water helps keep it fresh by preventing it from drying out, adding flavorings to the water introduces several risks. The flavorings, especially if they contain sugar or other organic compounds, can become a breeding ground for bacteria. Tofu itself is a protein-rich food, which also makes it susceptible to bacterial contamination. Storing tofu in flavored water, even in the refrigerator, doesn't guarantee the prevention of bacterial growth, and it can lead to foodborne illnesses. The best practice is to store tofu submerged in plain, fresh water in a sealed container in the refrigerator. Change the water daily to maintain freshness. For longer storage, consider freezing the tofu, which will alter its texture but preserve it safely.
If you're storing tofu in water, make sure to use filtered or previously boiled water to minimize the risk of introducing contaminants. Also, always smell the tofu before using it, even if it looks fine. A sour or unusual odor is a sign of spoilage, and the tofu should be discarded.