"The Messenger of Allah (ﷺ) was brought a small vessel (of water) and he performed Wudu'." I said: "Did the Messenger of Allah (ﷺ) perform Wudu' for every prayer?" He said: "Yes." He said: "What about you?" He said: "We used to pray all the prayers so long as we did not commit Hadath." He said: "And we used to pray all the prayers with (one) Wudu'."
Sunan an-Nasa'i Book 1, Hadith 132
← Previous Hadith "I saw 'Ali (may Allah be please with him) praying Zuhr, then he sat to tend to the people's needs, and when the time for 'Asr came, a vessel of water was brought to him. He took a handful of it and wiped his face, forearms, head and feet with it, then he took what was left and drank standing up. He said: 'People dislike this, but I saw the Messenger of Allah (ﷺ) doing it. This is the Wudu' of one who has not committed Hadath."

Sunan an-Nasa'i Book 1, Hadith 131 Next Hadith → "Shall we not bring water for Wudu'?" He said: "I have only been commanded to perform Wudu' when I want to pray."

Sunan an-Nasa'i Book 1, Hadith 133