Water is present as ice on:
Mars: under the regolith and at the poles
Earth-Moon system: mainly as ice sheets on Earth and in Lunar craters and volcanic rocks NASA reported the detection of water molecules by NASA's Moon Mineralogy Mapper aboard the Indian Space Research Organization's Chandrayaan-1 spacecraft in September 2009.
Jupiter's moons: Europa's surface and also that of Ganymede
Saturn: in the planet's ring system and on the surface and mantle of Titan and Enceladus
Pluto-Charon system
Comets and related (Kuiper belt and Oort cloud objects).
And may also be present on:
Mercury's poles
Ceres
Tethys