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I've used propane bottles (5 gal & 10 gal) for steam rocket motors before with great success. Some rust after awhile though, but not severe. I think they make rust inhibitors for car engines/cooling systems, so maybe a shot of that would work. It's in regular "antifreeze", but I think you can get a bottle of JUST the rust inhibitor. - maybe - You said you wanted them for thermal mass storage, not drinking, right?
Oh wait - just re-read your post. Potable water AND thermal mass? I wouldn't know about drinking out of them. I suppose if you washed them out real good, but - - - - - ??
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