The Messenger of Allah ﷺ used to perform ablution with a mudd of water and bathe with a saa.
حدثنا هشام بن عمار حدثنا الربيع بن بدر حدثنا أبو الزبير
أن رسول الله ﷺ كان يتوضأ بالمد ويغتسل بالصاع
[Sahih] Rabi bin Badr is discarded (matruk) (Taqrib*), but it has very many corroborating witnesses, among them the previous hadith, no. 267.