It was narrated from 'Aishah that she used to perform Ghusl with the Messenger of Allah ﷺ from a single vessel.  

أَنَّهَا كَانَتْ تَغْتَسِلُ مَعَ رَسُولِ اللَّهِ ﷺ فِي الإِنَاءِ الْوَاحِدِ