Cook bacon in large saucepan on medium heat until crisp. Add onion; cook and stir 3 minutes. Add water and potatoes. Bring to boil. Reduce heat to low; cover and simmer 5 minutes or until potatoes are tender.
Stir Gravy Mix and flour in medium bowl. Stir in half-and-half with wire whisk until smooth. Stir mixture into saucepan. Add turkey, corn and sage. Bring to boil on medium heat. Reduce heat to low; cover and simmer 10 minutes, stirring occasionally.