Question

Is the existence of water is really proven in Mars ??​

Answer 1

Almost all water on Mars today exists as ice, though it also exists in small quantities as vapor in the atmosphere. What was thought to be low-volume liquid brines in shallow Martian soil, also called recurrent slope lineae, may be grains of flowing sand and dust slipping downhill to make dark streaks.

in my words I think yes .

Answer 2

Answer:

Nope, it is not proven or found yet.

The research is still going on.