Hello...I understand your concern.
It seems he is having having viral diarrhea. Once it starts it will take 4 to 5 days to completely get better...up to a maximum of 14 days.
Unless he is having low urine output or very dull or excessively sleepy or blood in motion or green bilious vomiting...you need not worry.
There is no need to use antibiotics unless there is blood in the motion. Antibiotics might worsen if unnecessarily used causing antibiotic associated diarrhea.
I suggest you use zinc supplements (elemental zinc 20 mg once daily for 14 days) & ORS (Each small packet mixed in 200ml of potable water and keep giving sip by sip) as hydration is very important and crucial part of treatment. If there is vomiting you can use Ondansetron (as prescribed by your physician).
Regarding diet - Avoid fruit juices as they might aggravate diarrhea.
But she can take fruits as such as they contain fibre and help in formed stools. She can take zinc supplements & ORS apart from normal vegetarian porridges & soups.
Most crucial part is keeping him well hydrated. Make sure he passes urine at least 6th hourly once.
I sincerely ***** ***** I have helped you today!
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Kind regards ***** ***** Sumanth Amperayani