In a large nonstick skillet, brown sausage over medium high heat. Add onions, celery & peas to skillet. Over medium heat, cook, stirring occasionally, until vegetables are tender & sausage is cooked through, about 15 - 20 minutes.
Meanwhile, in medium pot, bring water, rice & dehydrated soup to boil; reduce heat to medium. Simmer until rice & noodles are tender, about 7 minutes, adding additional water if needed.