Fill a glass with about 1 cup of fruit or vegetable juice, milk or water. Pour in 1 envelope Knox Unflavored Gelatine, whisking lightly with a fork for smooth dispersal of gelatine. Drink at once. For a hot Knox Drink, sprinkle 1 envelope Knox on ¼ cup cold water. Add ¾ cup hot broth (or 1 bouillon cube and ¾ cup boiling water). Stir until gelatine and bouillon are dissolved.