As Muslims, we do not need to worry about food coming up to your throat; it is not the same as vomiting. In case of vomiting, according to many scholars, it would be considered as breaking wudu’ unless it is a recurring problem over which a person has no control, in which case it will be excused.
Food return, however, does not fall in the above category; no authentic school of jurisprudence considers it as invalidating one’s wudu’. Therefore, you need not worry about it whether it happens during salah or after; if it happens after salah, you may simply wash your mouth, if it causes doubt. That is all that is required.”