In a large pot or deep skillet, combine the dry penne pasta, jarred marinara sauce, water, olive oil, salt, black pepper, and dried Italian seasoning.
Stir well to combine all ingredients.
Place the pot over medium-high heat and bring the mixture to a boil, stirring occasionally to prevent the pasta from sticking.
Once boiling, reduce the heat to medium-low and simmer uncovered for 12 to 15 minutes, stirring frequently, until the pasta is cooked through and most of the liquid has been absorbed.
Remove the pot from heat and stir in the grated Parmesan cheese and chopped fresh basil.
Serve immediately, garnished with additional Parmesan or basil if desired.