You don't actually have to drain the water off b/c the last time I had to freeze tofu I didn't have time so I just stuck it in the freezer, it froze into a solid block, and then when I wanted it again I just pulled it out of the freezer and let it defrost in the fridge. Again, it comes out chewiers, more porous, but works pretty much the same way. I actually like it better after it has been frozen LOL =-)
Mattea