In a large skillet heat oil over medium-high heat. Add kielbasa; cook about 2 minutes or until browned. Stir in orzo. Cook and stir for 1 minute.
Stir in broth, the water, and Italian seasoning. Bring to boiling; reduce heat. Simmer, covered, about 10 minutes or until orzo is tender, adding the zucchini for the last 5 minutes of cooking and stirring occasionally. If desired, top with green onions. Season to taste with salt and black pepper.