Good question, and great to see you’re keeping the considerations of the community in mind!
No specific materials have been identified to us – the choice of materials you use in your design will be up to you to determine based on your research about what is needed for the tank. Based on what you have discovered, it’ll be up to you and your team to determine what materials are appropriate for the project. For example, what material will be able to withstand water pressure? Is the material readily available in Yirrganydji Country? What is the cost of your material?
These are all the choices you’ll have to make with your design based on what you have learned about the needs of the project and Yirrganydji Country.
Please let me know if you have any other questions!
Good luck with your project!