With those symptoms, I agree with Brenna, that Rotovirus is a very strong possibility. It would be a good idea to check it out with your doctor or an urgent care center because as the other moms said, dehydration is a big concern when you have a child with diarrhea. Also, a doctor can rule out other possibilities that may be more serious.
You can alternate tylenol and motrin for fever and pedialyte and gatorade are good for dehydration. It is a good idea to stay away from milk products when a child has diarrhea, unless you are breastfeeding, then I would talk to a pediatrician.
Juices tend to be harder to digest and are not a good idea with diarrhea. I am not sure if the symptoms are for your son or daughter. If they are for your daughter, the BRAT diet works real well for diarrhea if it can be tolerated. That is Bananas, Applesauce, Rice, Toast.
Hope that helps! You can message me if you have questions.