What about the liners people use to make ponds for landscaping? I have seen huge ponds installed so I imagine pond liners of all different sizes are available. Might cost more than it's worth though. An other thing you'd have to think about is how are you going to get the water up out of there? Solar powered pump? Hand pump? Those are probably readily available. You could probably find dozens of them at any yard sale. And to power it you just make some children. They are easy to make and they surely have enough energy to power a hand pump.
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