Mars once had lots of water. We cannot tell how much, but it appears Mars may have once experienced a global flood similar to the one I believe Earth experienced. 212F and then only if the atmospheric pressure is similar to earth's. With no atmosphere, water cannot exist in liquid form, but will go directly from ice to a vapor. On Mars, we see evidence of dried river beds and oceans.
Rivers get their water from the oceans as ocean water evaporates and forms clouds.
In other words, Mars once had rains, flowing rivers, and oceans. Of this we are almost certain. None of this data proves Mars had life. However, if life could have been carried there, the red planet might have been able to sustain it. It takes a lot more than the mere presence of liquid water to sustain life but at least Mars might have had a chance for life to have survived there.