STOPPING DIARRHIA

I have heard that a good strong cup of black tea will help stop diarrhia. Don't give any to kids as it would be to strong.
Also when my kids were little some of the old folks said to give them some blackberry juice.
 I took one of my kids to the e.r. one time with this and the doc. was a  doc. from across the water and he told me in his country that they cooked rice and took the soup off of it and drunk it and it would help with diarrhia. I tried this and it did work. I would not give this to babys tho.