Studies Support Use of Copper Water Bottles. The Benefits from storing water in a copper vessel.

The water canteen/bottle on the far left is made of copper.

https://vasantihealth.com/blogs/news/the-truth-about-storing-water-in-copper-vessels-debunking-the-myths

https://www.copperh2o.com/blogs/blog/copper-water-bottles-and-scientific-research