  We present the predictions of the SuSAv2-MEC model for the double
differential charged-current muonic neutrino (antineutrino) cross section on
water for the T2K neutrino (antineutrino) beam. We validate our model by
comparing with the available inclusive electron scattering data on oxygen and
compare our predictions with the recent T2K $\nu_\mu$-$^{16}$O data, finding
good agreement at all kinematics. We show that the results are very similar to
those obtained for $\nu_\mu-^{12}$C scattering, except at low energies, and we
comment on the origin of this difference. A factorized spectral function model
of $^{16}$O is also included for purposes of comparison.
