4yo vomited for 24hrs then went 24hrs vomit free, then woke up this morning drank water and immediately vomited twice, is this still stomach bug?

GI Bug and vomiting: Yes - this can be normal! After an infection of the GI tract - which may initially cause vomiting and diarrhea - the stomach and the rest of the intestines can remain sensitive to any irritation for a few days. The key is reducing any irritants - not too much intake at a time - nothing too hot or cold. The WHO ORS is good for hydration - If you see any blood in the vomit you should be seen.