Turn the Instant Pot® on. Choose the Sauté program and the Normal setting. Once it has come up to temperature, add the oil, garlic, and crushed red pepper. Cook for 1 minute.
Add the pasta, tomatoes, and water.
Close the lid and the vent. Use the Manual program and set the timer for 5 minutes.
After 5 minutes, quick-release the pressure according to manufacturer’s directions. Open the pot and add the remaining ingredients and stir through, allow to warm for 1 minute.