Preheat oven to 375°.
Combine 1/2 tub Knorr® Homestyle Stock - Chicken, herbs and garlic in small bowl. Rub mixture under chicken skin, then spread remaining on outside of chicken. Arrange chicken on rack in roasting pan. Roast 2 hours or until meat thermometer inserted in thickest part of thigh reaches 165°. Remove chicken from pan and keep warm.
To make gravy, combine water with flour in small bowl, then stir into pan over medium heat. Stir in remaining Stock, scraping up brown bits from bottom of pan. Cook, stirring frequently, until gravy is slightly thickened, about 5 minutes. Strain, if desired. Serve gravy with chicken.