HI, thanks for using healthcare magic Diarrhea is usually due to an infection though it can also be due to a reaction to certain foods. Most of these infections, if that is the cause, are not treated with antibiotics though some require it Dehydration is a very real worry especially in children, he is losing fluid through his frequent bowel movements and he may not be eating as well. The cerelac can possibly be contributing to the loose stool so you should consider stopping this. An oral rehydration product such as pedialyte would be better than the boiled water because the water is only giving fluids, not electrolytes. The medication , cipla powergyl should not be given unless your doctor suggests it for him I hope this helps