It's interesting how a lot of newer countries just put the right to water directly in the constitution. South Africa says some stuff about the government having an obligation toward "progressive realization" of the goal [1], whereas Slovenia just straight says water is a right [2].
[1]: https://www.gov.za/documents/constitution/chapter-2-bill-rig...
[2]: https://www.uradni-list.si/glasilo-uradni-list-rs/vsebina/12...