.... Why not start out with some outdoor kiddie pools this spring ....
I like that idea as step 2. In an old thread, CJ talks about how he built small forage ponds out of cinder blocks with a PVC liner. This has me thinking of building some 4 x 8 or 4 x 16 enclosures out of landscape timbers (I think timbers will look better than blocks). I know a web site where I can get remnants of liner pretty cheap. Thinking set it up near the pond with a small pump for continuous flow from the pond and back to the pond over a small spillway and little stream.
I'm thinking some small setups like that would work great for other things too, like pellet training YP recruits.