  Hydrodynamics of superfluids can be described by formally dividing the fluid
into a normal fluid and a superfluid part. In color-flavor locked quark matter,
at least one superfluid component is present due to spontaneous breaking of
baryon number conservation, and an additional one due to the breaking of
strangeness arises once one takes into account kaon condensation. We show how
such a two-component description emerges from an underlying scalar field theory
which can be viewed as an effective theory for kaons. Furthermore, the
occurring hydrodynamic quantities in the low-temperature limit are related to
the microscopic parameters provided by the Lagrangian which closes the gap
between field theory and hydrodynamics, which are important for astrophysical
calculations.
