It was narrated from 'Aishah that she used to perform Ghusl with the Messenger of Allah ﷺ from a single vessel. (Using translation from Nasāʾī 72)  

أَنَّهَا كَانَتْ «تَغْتَسِلُ مَعَ رَسُولِ اللهِ ﷺ فِي الْإِنَاءِ الْوَاحِدِ»