In general, the best place for the collection and distribution of one’s Zakaah and charity - and this includes Zakatul-Fitr—is one’s locality or community, be it in one’s city, state, or country. This is strongly implied in the statement of the Prophet  in sending the famed Companion Mu’aath Ibn Jabal  to teach the people of Yemen. He said to him, “Inform them that Allah has made the paying of Zakaah obligatory on them. Take it from their rich and give it to their poor.”
There are provisions for transferring Zakaah resources to other communities among Muslims; however, special guidelines for doing so have been established by Muslim scholars in accordance with Islamic legislation, to which the institutions responsible for the collection and distribution of Zakaah among Muslims are to adhere.
The following points should be noted concerning Zakatul-Fitr:
1. Zakatul-Fitr is obligatory upon every Muslim who has the food or provision to sustain himself, and those whom he is obligated to support, on the eve and the day of Eid, provided that this exceeds his basic needs.
2. A man is obliged to pay Zakatul-Fitr for his wife and minor children who have no money of their own. In the case of one who has independent children, one is not obliged for their payment.
3. What is obligatory is the giving of a Saa’ (four handfuls) of dates, barley, raisins, or other such grain, equal to about 2.25kg of wheat. Originally, the giving of Zakatul-Fitr was limited to the kinds of food that had been stated in the relevant statement of the Prophet . However, jurists have established (through proper methods) that it may be given out of other commonly consumed foods, such as rice, meat, milk and so forth, but should be valued in accordance with the items specified by the Prophet . Moreover, it is permissible to give Zakatul-Fitr in currency by paying the equivalent value of what is obligated. Those Muslim institutions entrusted with its collection and distribution are required to assess the value of the originally specified items in their areas, and to disseminate that information in their communities, accordingly.
4. Zakatul-Fitr must be given before the prayer of Eid. It is forbidden to delay it until after the Eid day. If one, for any reason, is prevented from giving it at that particular time, one must pay it after that time passes. If there is a need, Zakatul-Fitr may be given at any time from the beginning of the month of Ramadan that is, its first day—until the end of the specified time [of Eid day].
5. It is permissible for one to delegate another to give Zakatul-Fitr on one’s behalf.
6. It is permissible for the institutions that collect Zakatul-Fitr to exchange it from goods to currency, and vice versa, based on the general interest of the community.
7. It is permissible, in special cases, to transfer Zakatul-Fitr collections from the people or locality in which it was collected to nearby communities in more need. And it is equally permissible to spend Zakatul-Fitr in another community, if the giving community has no one in need of it.
8. One must have a clear intention before giving one’s Zakatul-Fitr. If one delegates, or gives permission, to another to give Zakatul-Fitr on his behalf, it is considered an explicit intention.
9. If the community decides, after due process of consultation among its leadership and scholars, to delay the spending of what it has collected from Zakatul-Fitr payments until after the day of Eid, then this may be done, provided that it serves a clear benefit for the community.
10. The Zakatul-Fitr payment should be dedicated to the poor and the needy. In some cases, however, it can be given to eligible recipients of Zakat of wealth; namely those stated by Allah in the following verse (which means): “for the poor and the needy, and for those who work [to administer it], and for those whose hearts are to be reconciled, and for freeing captives (or slaves), and for those in debt, and for the cause of Allah, and for the wayfarer…” [Qur’an 9:60]
Article source: http://www.islamweb.net/emainpage/

Zakatul-Fitr is obligatory even for one who does not fast
Question: I am a Moroccan Muslim woman living in a foreign country. I have three sons, the eldest is 19 years old and the youngest is 13 years old. They do not fast. Am I required to give Zakatul-Fitr  on their behalf or not? Thank you.
Fatwa: All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallaahu ‘alaihi wa sallam, is His slave and Messenger.
You are, first and foremost, required to urge your sons to fast in Ramadan and to command them and motivate them through all possible means. The person who attains the age of puberty and abandons fasting in Ramadan commits a grave, major sin. Moreover, whoever attains the age of puberty and deliberately abandons fasting in Ramadan is required to make up for the days of fasting that he has missed since having reached the age of puberty. He is also required to sincerely repent to Allah.  
As for Zakatul-Fitr, if your sons have their own property, then they are obliged to pay it from their own wealth. If you still provide for them, then you are required to give Zakatul-Fitr on their behalf.  Subsequently, Zakatul-Fitr must be given even if they do not fast. Although abandoning fasting is a grave major sin, it does not exempt one from the obligation of giving Zakatul-Fitr, which is an independent duty. The Prophet, sallallaahu ‘alaihi wa sallam, made Zakatul-Fitr obligatory for each Muslim. So, your sons are included in this general command of the Prophet, sallallaahu ‘alaihi wa sallam, as long as they are Muslims.
Allah knows best.
Source: The Ministry of Awqaf and Islamic Affairs