Preheat oven to 425 degrees and prepare a baking sheet by lining it with foil or parchment paper.
Combine Italian sausage, bread crumbs, onion, and ¼ teaspoon pepper.
Form into 1-1 ½ inch meatballs and place on the baking sheet. Bake for 15-20 minutes, or until cooked through.
Meanwhile, heat olive oil in a large Dutch oven. Add sweet peppers, onion, garlic, salt, and pepper.
Cook 6-8 minutes, until the vegetables have begun to soften.
Add tomatoes, zucchini, oregano and basil, cooking an additional 6-8 minutes, stirring often.
Add broth and water. Stir in meatballs. Bring to a boil and add uncooked orzo.
Simmer for 9-12 minutes, until orzo is cooked through.