Some time prior to July 12, I bought some Vitasoy Firm tofu at the Asian market. July 12 is the expire date stamped on the package.
I just opened it this afternoon, Aug. 12, and it seemed OK. Certainly didn't smell bad, and the water it was packed in, was still clear.
Since I rarely use enough bean curd at one time, I store it in brine (tap water + kosher salt). I change the water occasionally, and if I'm on top of it, the beancurd never goes bad.