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

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، أَنَّهَا كَانَتْ تَغْتَسِلُ مَعَ رَسُولِ اللَّهِ ﷺ فِي الإِنَاءِ الْوَاحِدِ .