While tofu presses are pretty nifty, you don't really have to use one. Simply place the tofu on a plate lined with a few layers of paper towels. Put more paper towels on top of the tofu, place a cutting board or tray on it, and set a weight on top of that. For weight, you can use a cast iron pan, canned goods, or a heavy book. Let it drain for 30-60 minutes.