Translation:Water is one of everyone's basic needs.
Hai teman! Here is a nominal phrase in Indonesian: "salah satu", meaning "one of". (perhaps it is not included between the dictionary suggestions, so please report the lack)
Also, the sentence uses the verb "merupakan" (the root is "rupa", shape, form), meaning "to take the form of", "to constitute", or "to be", so:
Air (Water) + merupakan (is, constitutes) + salah satu (one of) + kebutuhan (needs) + dasar (basic) + semua orang (all the people, everyone)
Selamat belajar! :)