system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU Infinity War] How did Thanos turn the Aether (Reality Stone), a liquid, into a stone?
gpt
On its own, it flows into different shapes and states, altering reality because that's what it does.  Sometimes it's a liquid, sometimes solid, sometimes particle cloud, etc.

Once you have it, reality can be whatever you want it to be.  You can fix it in any state you desire.