thanks for asking Health Care Magic.
It seems the boy has got Intestinal infection probably GIARDIASIS
(caused by Giardia Lamblia, a parasite) transmitted to the human beings by consuming the water or food, contaminated with the trophozoites & cysts of the abovesaid parasite.
Give him as much as of Oral rehydration salt solution to avoid dehydration
for 7-10 days for the parasitic infection
, along with antispasmodics for the cramps.
To avoid future episodes I suggest
1. Drink Always, boiled water which is filtered through a filter with a pore size of
2. Do not eat uncooked or unpeeled fruits or vegetables grown in conditions in which contamination with Giardia might occur.
3. Wash hands before eating food, using the bathroom, or touching pets.