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 chicken 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 1/2 tub 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.