BUILD FLAVOR: Heat oil in pressure-cooker pot over medium-high heat until shimmering. Stir in sausage, onion, and bell pepper and cook, breaking up meat with wooden spoon, until sausage is no longer pink, about 5 minutes. Stir in tomato sauce, water, and ziti.
HIGH PRESSURE FOR 5 MINUTES: Lock pressure-cooker lid in place and bring to high pressure over medium-high heat. As soon as pot reaches high pressure, reduce heat to medium-low and cook for 5 minutes, adjusting heat as needed to maintain high pressure.
QUICK RELEASE PRESSURE: Remove pot from heat. Quick release pressure, then carefully remove lid, allowing steam to escape away from you.
BEFORE SERVING: Bring mixture to simmer over medium-high heat and cook, stirring often, until pasta is tender, 2 to 5 minutes. Stir in basil and season with salt and pepper to taste. Serve.
Cooking Sausage in a Pressure Cooker
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