LAMMPS SPC/E Water: Energy vs volume data

You could also take a look at equations of state for SPC/E:

Guissani, Y. & Guillot, B. A COMPUTER-SIMULATION STUDY OF THE
LIQUID-VAPOR COEXISTENCE CURVE OF WATER J. Chem Phys., AMER INST
PHYSICS, 1993, 98, 8221-8235 http://dx.doi.org/10.1063/1.464527

Plugatyr, A. & Svishchev, I. M. Accurate thermodynamic and dielectric
equations of state for high-temperature simulated water Fluid Phase
Equilibria, 2009, 277, 145-151
http://dx.doi.org/10.1016/j.fluid.2008.12.003

Hayward, T. & Svishchev, I. Equations of state and phase coexistence
properties for simulated water FLUID PHASE EQUILIBRIA, ELSEVIER
SCIENCE BV, 2001, 182, 65-73
http://dx.doi.org/10.1016/S0378-3812(01)00381-8