These guys have water storage tanks:
http://www.zcl.com/products/water-pr...ter-tanks.html
And the installation instructions online:
http://www.zcl.com/assets/documents/...rage-Tanks.pdf
Not saying you have to buy from ZCL, it's just a company that came to mind because I've seen them installed at work before and figured they would have online manuals and such for a quick reference.