"The Prophet prohibited using the leftover (water) of a woman's Purification."  

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ فَضْلِ طَهُورِ الْمَرْأَةِ قَالَ وَفِي الْبَابِ عَنْ عَبْدِ اللَّهِ بْنِ سَرْجِسَ  

"The Prophet forbade that a man should perform Wudu with the leftover (water) from a woman's purifcation." Or, he said: "from her drinking."  

أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يَتَوَضَّأَ الرَّجُلُ بِفَضْلِ طَهُورِ الْمَرْأَةِ أَوْ قَالَ بِسُؤْرِهَا