Rigid plastic tanks are probably the best way to go. I would recommend four tanks, since it would provide better protection against contamination, and allow you spread the load out more for ballast purposes.
Another option is to have fiberglass tanks made. They can be made custom to fit your boat, and may be a better choice in terms of strength, weight and longevity.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.