Extraterrestrial liquid water
The Gliese 581 planetary system contains multiple planets that may be candidates for surface water, including Gliese 581c, Gliese 581d, might be warm enough for oceans if a greenhouse effect was operating, and Gliese 581e.
Interstellar ice
Research published in the journal "Science" estimates that about 30–50% of the water in the solar system, like the water on Earth, the discs around Saturn, and the meteorites of other planets was already around even before the birth of the sun.