New to my area, you may have seen this before now. The outfit is Camel Water Systems. (http://camelwater.com/camel-oasis/) They have multiple kinds of rotomolded storage tanks - most designed to fit in-betwen wall studs of all things. They also have a free standing rain water collection system. I'm pretty sure everyone here is handy enough to do this one better. I still find it interesting that these folks see a market. They also sells these modules for fuel storage, although local laws would likely prohibit such use in most of the US at any rate,. Thought I post this up in case anyone is intrested.