In a large skillet or wok, heat oil over medium-high heat. Add turkey; stir-fry until no longer pink, about 5 minutes. Remove and keep warm., Add the next 6 ingredients to pan; stir-fry until vegetables are crisp-tender, about 5 minutes. Combine water, soy sauce and cornstarch; add to skillet with water chestnuts. Bring to a boil; cook and stir 1-2 minutes or until sauce is thickened. Return turkey to skillet and heat through. Serve with rice and tomato wedges.