How to Make It
Spray inside of 4-quart slow cooker with cooking spray. Add tomato sauce, water, squash and garlic powder to slow cooker; stir to combine. Pinch sausage into bite-size pieces and place in slow cooker.
Cover; cook on LOW 7-1/2 hours or on HIGH 3-1/2 hours.
Stir in pasta and spinach; cover and cook on HIGH 30 minutes more or until pasta is tender.