Weeknight Miso Soup with Tofu for One

Name: Weeknight Miso Soup with Tofu for One
Yield: Serves 1
Ingredients: 2 cups chicken or, vegetable broth; 1 cup, water; 2 tablespoons, white miso; 7 ounces silken, soft, or, firm tofu, cut into ½-inch pieces; 2 , scallions, green parts only, sliced thin; 1 sheet toasted, nori, crumbled