The molecular water incorporation in bioapatites obtained by bone pyrolysis at temperatures of 600–1100 °C has been investigated using in situ solid ¹H nuclear magnetic resonance (solid ¹H NMR) method in the temperature range of T = 25–300 °C and, in addition, ¹H magic-angle spinning NMR, X-ray diffraction and infrared spectroscopy at room temperature. For comparison, synthetic analogues of bioapatite, precipitated hydroxyapatite (HA), HA with La impurity and carbonate fluorapatite were investigated as well. It was established that there are water molecules adsorbed on crystallites surfaces and bound in structure (H₂O_s) in studied apatites. More rigid H₂O_s1 molecules cause the doublet under normal conditions and the wide singlet at T ≥ 150 °C in situ ¹H solid NMR spectra. In addition, H₂O_s3 molecules with reorientation mobility at T = 150–300 °C are presented in bioapatite and HA annealed at lower temperatures and La-HA. Water incorporation into structure of bioapatite annealed at 600–1100 °C and its synthetic analogues HA is established to be zeolite-like. Presumably, the configuration of cavities is formed in the apatite crystal scaffold during annealing of studied apatites. These cavities are related with vacancy clusters in original structures and connected between themselves and with surface by the channels with a diameter of not more than 0.3 nm. Water molecules trapped in smaller (H₂O_s2) and larger cavities (H₂O_s1) cause the doublet and singlet, respectively; water molecules in OH vacancies in channels (H₂O_s3) are due to narrow lines.