Is it permissible to vary the food for the poor in an oath expiation, or must one suffice with a single type or specific types?

It is permissible to give the expiation for an oath to a single family consisting of ten or more needy persons. The expiation must be food, not money, amounting to half a sa' for each needy person from the staple food of the land. It is recommended that it be accompanied by a condiment (idām). It is permissible for the food given to be of different types (such as rice, wheat, and dates). Rice and flour are sufficient for expiation because they are staple foods for people. As for milk, it is sufficient in two cases: if the needy persons are Bedouins who subsist on it, or if they are poor children who are nourished by it. Oil alone is not sufficient as expiation because it is not a food that people subsist on; rather, it is a condiment or something used to improve food.