Drinking lots of water will also help in flushing out toxins and infections from the urinary tract. Drinking about three to four quarts of water daily is the best cure for treating kidney infection as well other internal infections.Many people have also tested the benefits of Vitamin C in treating kidney infection.he pain resulting from the kidney infection can be treated by holding a heat pad against the lower abdomen. It will also help to wear comfortable and loose fitted clothes. Garlic and Echinachea are also used to treat kidney infections as they serve as natural antibiotics.