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The asymmetric unit of the title compound, C8H20N+·C4H5O5−·1.36H2O, contains two independent ion pairs, with similar conformations, and three water molecules of crystallization, one water molecule haing a site-occupancy factor of 0.721 (5). Intramolecular O—H...O hydrogen bonds, involving the hydroxy groups and an O atom of each carboxylate anion, generate five-membered rings involving S(5) ring motifs. In the crystal structure, molecules are linked together by water molecules through four-membered O—H...O—H...O—H interactions to form one-dimensional infinite chains along the a axis. Since the molecules are also linked into one-dimensional infinite chains along the b axis, molecular sheets parallel to the (001) plane are created. Overall, the crystal structure is stabilized by two intramolecular O—H...O hydrogen bonds, nine intermolecular O—H...O and ten C—H...O hydrogen bonds.

In the crystal structure of the title compound, C8H20N+·C4H5O6−·2H2O, the ions and water molecules are linked via O—H...O and C—H...O hydrogen bonds, forming a two-dimensional network parallel to (001).