Manicotti is made the same way as Stuffed Shells, except the pasta is made as follows:
2 cups flour
2 cups water
Mix the batter, and let stand for twenty minutes. Ladle about 1/2 cup into a lightly buttered saute pan. Cook until the noodle firms up, flip, and cook for a few more seconds. You do not want the noodles to brown.
Use the cheese filling and assembly steps from the Stuffed Shells recipe.