I tested my 64oz Ocean Spray bottles. They actually hold 67oz filled to the brim. I can squeeze out 7 oz of water, or 11% volume change, and have them satisfactorily hold their shape. They can withstand the expansion/contraction of any PCM. Interestingly, the bottles stayed collapsed where I squeezed them easier than they would collapse at the "panels" that were designed to flex. Even with that, they were nice and rigid at the perimeter.
At 2 or so per week personal use, it will take me a while to gather 400+ of them for the entire tank. I might find some neighbors that use products in similar bottles and ask them for theirs.
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"I‘d put my money on the sun and solar energy. What a source of power! I hope we don‘t have to
wait until oil and coal run out before we tackle that." Thomas Edison, 1847 — 1931
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