For pure water we have
18 g/mole,
0.461 j/g 
K
and
The latent heats are
334 J/g for fusion,
2500 J/g for evaporation and
2834 J/g for sublimation.
The triple point, where ice, liquid and vapor are in
equilibrium, is at P = 6.1 mb and T = 273.16 K,
and the critical point is at P = 218 bars and
T = 647 K.
See the article by Fofonoff in The Sea, Vol. 1, 1962
for more details.