Add sauce ingredients to Instant pot and cook on max pressure 40 minutes or high pressure 45 minutes. Quick release. Puree ingredients using immersion blender or regular blender. Add Italian sausages to sauce and the instant pot to max pressure for 1 minute or high pressure for 2. Quick release. Remove the sausages to another dish, and add Cellantini, mushrooms, and water. Cook on Max pressure for 3 minutes or high pressure for 4. Quick release and check for pasta doneness. Add minutes if pasta is too firm. Add peppers and sausage and heat on sauté until the entire mix is hot.