Sunan Ibn Majah Book 1, Hadith 118
On the night of the jinn, the Messenger of Allah said to him: "Do you have water for ablution?" He said: "No, I have nothing, but some Nabidh in a vessel." He said: "Good dates and pure water (i.e. there is no harm from the mixing of the two)." So he performed ablution with it. This is the narration of Waki'.
The Prophet and she used to perform ablution together for prayer.
On the night of the Jinn the Messenger of Allah said to Ibn Mas'ud: "Do you have water?" He said: "No, only some Nabidh in a large water skin." The Messenger of Allah said: "Good dates and pure water." (i.e. there is no harm from the mixing of the two.) Pour it for me." He said: "So I performed ablution with it."