Sanyasins, brahmacaries, travelers, those who are in abject poverty are all qualified to take bhiksha. Sanyasins and brahmacaries are not not in a position to cook. Sanyasins have no right to use fire whereas the brahmacaries have no time as they are studying. So they must be given cooked rice. A gruhasta who is asking for bhiksha should be offered only uncooked rice.
The householder can eat only after checking that adities, elders in the house, married girls, pregnant ladies, sick persons, and the workers in the household have partaken their food.
The person who comes at the end of vaishvadevam is a good Aditi, it is said that one need not inquire about his caste, his gotra, his acara, branch of veda he belongs to, or what Shastra he follows. We must do Aditi Pooja to this person. Many risis see him as Vyasa himself. To do such a Puja is equivalent to an yagna without the yupa (a staff planted in the yagna-shaalaa).
This Puja involves inviting the person, giving water to drink, washing the feet, offering water in the hand and giving pain relieving oil. He is offered a seat, fed and to rest a bed is offered.
A special offering can be what is called Madhu barga.
This is offered if the Aditi is one learnt bhrahmana, one's teacher, rthvik (one who does yagna for the person), the King, the father in law and the maternal uncle.(only if these people have not visited in the last one year they must be offered madhu barga.) This is prepared by mixing honey with milk or curd. With each action in this Puja, we please, a particular Devatha. Inviting pleases Soorya; Good words spoken pleases Sarasvati; well coming agni; offering a seat indra; washing feet pitrus; food prajapati; offering bed – bhrahma, vishnu and maheswara!!
This thing is to be done according to one's ability. Even if your resources does not allow, let your wife and children reduce their consumption but never neglect your aditis and workers – this is the rule. If you cant offer food offer water, if you cant offer bed offer a place to lie down and rest.
Sathathapar says that the worlds reached by people who do aditi puja is not reached even by people who do yagnas and thapas.
What of the evening? Even if a person does not arrive by the time of vaishvadeva he is to be taken care of. He is called 'Suryotan' and where would he go in the night? This person should never be refused- sastras say eight times sin accumulates if such a person is refused compared to refusing during the day.
It is quite possible that this can be misused and sastras cover that eventuality too.