  The pivotal reason why many physical properties of water are notoriously at
odd with Boltzmann's statistics is that the states of equilibrium of H$_2$O are
Bose-Einstein-condensates -- free of quantum and statistical fluctuations --
protected against depletion by the modest dissociation threshold of the
H-bonds. Indeed, condensates support a line of reasoning proceeding from the
laws of quantum mechanics to macroscopic phenomena, with no
quantum-to-classical discontinuity and no arbitrary hypothesis. The phases of
water are two-level systems, with or without tunneling splittings of second
order. The heat capacity indicates departure from equipartition of energy due
to entanglement. The thermal energy of every phase is determined by occupation
numbers and a phase transition occurs whenever molecules bunch into either
level. The latent heats mirror changes of the number of degenerate condensates
and of the H-bonds. The structures of the three phases are isomorphic hexagonal
lattices. This case study demonstrates existence of condensates for the three
phases of the matter in an everyday environment.

Statistical Mechanics;Chemical Physics