Urwa ibn al-Zubayr عروة بن الزبير · The Book of Water

"A man asked the prophet (ﷺ): 'O Messenger of Allah, we travel by sea and we take a little water with us, but if we use it for Wudu', we will go thirsty. Can we perform Wudu' with seawater?' The Messenger of Allah (ﷺ) said: 'Its water is a means of purification and its dead meat is permissible.'"

It was narrated from Al-Hakam bin 'Amr that the Messenger of Allah (ﷺ) forbade a man from performing Wudu' with the leftovers of a woman's (water for) Wudu'.