What fluids to drink if you have diarrhea?
Ginger ale can help
Drink 8-10 glasses of fluid a day. Clear fluids, such as water, some fruit juices (apple, cranberry), broth, decaffeinated teas, and soft drinks like ginger ale that have been allowed to go flat, are often recommended. Drinking plenty of fluids, especially when you have diarrhea, is very important to avoid dehydration.
A note about drinks specially formulated with minerals

Should you consume drinks like Gatorade if you have diarrhea?