They have these at Walmart for 10 bucks. It's #2 plastic, BPA free.http://domsoutdoor.com/Reliance+Aqua-Tainer+7+Gallon+Water+Container/p/1-011175/sid/Froogle/eid/FR1/
For a primary? Drill out a spot up top for an airlock, Has a spigot, and a regular cap.
Did you end up getting and using this? I've been looking at similar products.