What is the best treatment for a runny tummy?

Depends on severity: Healthy, young adults can get the diarrhea of stomach flu symptoms from time to time. A patient will usually have diarrhea until her poop has all come out, which is why it is important to not eat or drink anything for a few hours afterwards. After that, a common treatment is small amounts of Pedialyte or broth, maybe 1 ounce every half hour the first day, while awake. Primary care doctor can help.