Cook fettuccine according to package directions, omitting salt: drain. Melt butter in heavy saucepan over low heat: add flour: stirring until smooth. Cook 1 minute stirring constantly. Gradually add half & half and water, cook over medium heat stirring constantly until mixture is thick and bubbly. Stir in parmesan cheese and remaining ingredients. Toss with fettuccine. Serve immediately. Yield is