Try a Tincture

For that most unpleasant of stomach upsets, diarrhea, blackberry root tincture can help. This herb contains tannins, substances that have astringent effects on the intestinal lining. Look for the tincture at health-food stores or online  and take 1 teaspoon of it in water every two to four hours until symptoms subside.

source-www.wholeliving.com