Black or dark green vertical water storage tanks are manufactured using resins that meet FDA specifications for the storage of potable water. The black or dark green color limits light penetration which reduces the growth of water-borne algae. These tanks are constructed for use with water only.
We will package a tank for you specific needs.  Fittings, insulation, water makeup. pump tank systems, packaged on skids.  Go to the Norwesco link for details and contact us with any questions. 
http://www.norwesco.com/Index.cfm?Section=WWM&Page=WWM06