Last Sunday, as we added a nutritious rich food - goat's liver to our lunch after a very long time, our body rejected it and caused Diarrhea. I felt so tired because of this problem and also dehydrated. Hence, had a cup of black tea and observed a quick remedy in an hour time!
Note: Lemon can be added to the black tea(unsweetened).
Though there are many remedies for Diarrhea, I found this remedy handy and helpful through experience.