Nutritional yeast is not the same as active dry or brewer's yeast. Nutritional yeast can be purchased at your local health food store in flakes or powder. This recipe calls for 1/4 cup nutritional yeast flakes; if you must use powder, only use 2 tablespoons as it is more concentrated.
You may use cold vegetable broth instead of water for the simmering broth. I prefer to use a cast iron skillet when frying seitan for the best flavor and texture.