Preheat oven to 350 degrees. Grease a large shallow baking dish. Combine the water and milk and heat to simmer. Add the cornmeal, salt, sugar, and butter, and stir over medium heat until the mixture is thickened, about 5 minutes. Remove from the heat. Beat the eggs with the baking powder until they are very light and fluffy, then add them to the cornmeal mixture. Mix well. Pour into the prepared dish and bake for 45 to 50 minutes. S. Serve hot.