What Is The Equation For Copper Plus Water?

Depends on the ionization level of the copper
for copper(II) its
Cu(+2) + H2O --> CuO + H2 (with the 2s as subscript)
for copper(I) its
2Cu(+1) + H2O --> CuO + H2 (with the 2s after the hs subscript and the 2 before the copper normal)