Alms Tax: Giving Fitrah from Different Items for Multiple People
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 2037
If a person gives fiṭrah on behalf of a number of persons, it is not necessary for him to give it all from the same item. For example, it is sufficient if he gives the fiṭrah of some in wheat and the fiṭrah of others in barley.
-Ayatullah Sistani, Practical Laws of Islam, Alms Tax (Zakat)