Source text
وَيَصِيرُ الْمَاءُ مُسْتَعْمَلًا بِمُجَرَّدِ انْفِصَالِهِ عَنِ الْجَسَدِ
• Water becomes used when it separates from the body after being used for removal of ritual impurity or for an act of devotion.
• If a person who already has Wudu merely washes away dirt or cools the hands, without intending an act of devotion, that runoff does not become used water for this reason.
• When water is actually used to remove ritual impurity, a separate intention of gaining reward is not required for the runoff to become used.