Al-Kāfi - Volume 3 > Taking Wudu’ with the Water from Which a Woman during Her Hayd (menses), People After Having Carnal Relations, a Jew, a Christian or a Person Hostile toward ’A’immah Has Drunk (Fatwa best explains Ahadith 4-6 of this chapter.)
Hadith #2

2ـ مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنِ الْعِيصِ بْنِ الْقَاسِمِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) هَلْ يَغْتَسِلُ الرَّجُلُ وَالْمَرْأَةُ مِنْ إِنَاءٍ وَاحِدٍ فَقَالَ نَعَمْ يُفْرِغَانِ عَلَى أَيْدِيهِمَا قَبْلَ أَنْ يَضَعَا أَيْدِيَهُمَا فِي الإِنَاءِ قَالَ وَسَأَلْتُهُ عَنْ سُؤْرِ الْحَائِضِ فَقَالَ لاَ تَوَضَّأْ مِنْهُ وَتَوَضَّأْ مِنْ سُؤْرِ الْجُنُبِ إِذَا كَانَتْ مَأْمُونَةً ثُمَّ تَغْسِلُ يَدَيْهَا قَبْلَ أَنْ تُدْخِلَهُمَا فِي الإِنَاءِ وَكَانَ رَسُولُ الله (صلّى اللهُ عَلَيْهِ وَآلِه) يَغْتَسِلُ هُوَ وَعَائِشَةُ فِي إِنَاءٍ وَاحِدٍ وَيَغْتَسِلاَنِ جَمِيعاً.

2. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from Safwan ibn Yahya from al-‘Is ibn al-Qasim who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, ‘Can a man and a woman take a Ghusl (bath) from the same water container? 5 He (the Imam) replied, ‘Yes, they can do so. They first must pour water on their hands and then place their hands in the water container. 5 I (the narrator) then asked, about the leftover water from which a woman during her Hayd (menses) has drunk. He (the Imam) said, ‘Do not use it for Wudu 5 but it is permissible to use for Wudu 5 the leftover water from which a person after sexual relations has drank if such person is trustworthy (in matters of cleanliness). She then must wash her hands before placing them in the water container. The Messenger of Allah and ‘A’isha would take Ghusl (bath) together from one water container.