Is it a condition to write an acknowledgment stating that the water filter designated for drinking is on behalf of the deceased so that she may receive the reward, and does the reward reach her only through the beneficiaries' supplications or by their drinking the water?
This project is an ongoing charity (sadaqa jariya), which is a type of endowment (waqf). Its reward will be established for your mother, by the permission of Allah, as soon as you intend it, and writing it down is not a condition for that.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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