  The derivation of Lifshitz-invariant hydrodynamics from holography, presented
in [arXiv:1508.02494] is generalized to arbitrary hyperscaling violating
Lifshitz scaling theories with an unbroken U(1) symmetry. The hydrodynamics
emerging is non-relativistic with scalar "forcing". By a redefinition of the
pressure it becomes standard non-relativistic hydrodynamics in the presence of
specific chemical potential for the mass current. The hydrodynamics is
compatible with the scaling theory of Lifshitz invariance with hyperscaling
violation. The bulk viscosity vanishes while the shear viscosity to entropy
ratio is the same as in the relativistic case. We also consider the dimensional
reduction ansatz for the hydrodynamics and clarify the difference with previous
results suggesting a non-vanishing bulk viscosity.
