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Yes, those Plastimo flexible water tanks are made of PVC and although some manufacturers say that it is FDA approved, I wouldn't want it on my boat. The other manufacturers of flexible water tanks on Defender say that they have three layers, the inside one presumably is safe for water storage.
But permanent tanks in boats are either rotomolded polyetheylene as Peggie notes which is safe for water storage or aluminum or sometimes stainless steel, all of which are safe.
FWIW rigid PVC as used in home piping does not have the plasticizer additives that the flexible stuff has, so the rigid stuff is safe for water.
David
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