Purity: Unavailability or Impermissibility of Sidr or Camphor

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 542:

If sidr leaves and camphor, or one of them, cannot be found, or if using them is not permitted – for example, they are usurped – then based on obligatory precaution, a person must perform one tayammum on the deceased; and in place of whichever one was not possible [i.e. in place of the sidr leaves and/or camphor that could not be found or its use was not permitted], ghusl must be given with ordinary water.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)