I have understood your complaint.
First of all maintain adequate liquid intake to prevent any hydration. Be it normal water/ORS/coconut water/chaas .
No ondem won't help in preventing loose stools
Next Steps
take 1 sache of Ors packet and mix it in 1 lt water bottle. start giving it frequently. we have to give this mixed solution as much as possible within 24 hrs. Do it for 3 days.
also tab darolac twice a day for 3 days
Health Tips
caution is we need to examine the child to check the signs of dehydration. This treatment is just an advice without examining the patient