In a large, heavy stock pot put potatoes, carrots, onions, chicken stock, salt and pepper. Boil on medium high for 15 minutes
In a separate boil whisk flour, water and sour cream until smooth and add to your soup after it has cooked for 15 minutes, stirring constantly. Once soup has thickened, which should be about minute, add in the pickles and pickle juice. At this point taste your soup and see if it needs more salt. Depending on the pickle juice is dependent how much salt you add. Do it to your taste
Cover and boil for 15 minutes over medium low heat, stirring occasionally. Voila! You have soup.