Try these remedies for diarrhea -

• To control diarrhea drink strong black coffee (without milk).
• Boil cup water with added 2 tsp arrowroot powder in it. Drink this every 2-3 hours. This is a very effective remedy for diarrhea.
• Avoid milk for few days instead drink buttermilk 3-4 times a day. The acid and micro flora in buttermilk will help fight with the bacteria and overcome harmful intestinal flora.
• Pomegranates have astringent property in treating diarrhea. Eat pomegranate or drink pomegranate juice. 
• Apples in stewed form are also useful in treating diarrhea.
• Lost fluids should be compensated by drinking more water.
• Eat soft, easily digestible foods; avoid spicy, fried/oily foods.