Q. During roza, if water enters the throat by mistake in wuzu what is to be done?
If the wuzu is for farizatnamaaz then the roza is valid, if the wuzu is for nafelatnamaaz it should be repeated.
Q. During Ramadan, if a person eats or drinks under the assumption that fajr has not arrived yet, and he realizes after the fact that it had indeed arrived then what must he do?
1) If he sought the time of fajr before eating, but found out later that he misread the time then his roza is valid.
2) If the person did not seek the time before eating, and assumed that fajr hadn't arrived when in fact it had then he must repeat his roza.