Return the skillet to medium heat. Add the ginger and garlic and sauté for 30 seconds, until fragrant. Stir in the soy sauce, maple syrup, and rice vinegar. In a small bowl, make a slurry with the water and cornstarch, whisking together until the cornstarch is completely dissolved. Slowly pour the cornstarch mixture into the saucepan, stirring continuously. Bring to a boil and boil for 2 minutes, until the sauce begins to thicken. Add the tofu back to the pan and stir together so that the sauce fully coats the tofu.