Underground Dream

So I had this dream where I was stuck in a cave with a few other people I don't specifically remember but it had a "Lost" kind of vibe. The cave had ocean water flowing into it like waves and we were looking for water to drink. I just happened to have this kit of eye droppers that I could test the water with and for obvious reasons we couldn't drink the ocean water because of the salt. Then there was this other pool of rancid yellow acidic water with these large crystals of ridiculously vibrant colors submerged in it. This stuff was absolutely undrinkable but then by a miracle the ocean water was splashing in and when mixed with the acid water it would smoke and bubble then become clear sparkling blue water that we could drink. It looked great visually in my dream but I doubt there was any logic to this mixing of water. Anyhoo, so we proceed out of the cave into this underground, massive bunker of sorts with a series of underground tunnels. We were trying to find a way out when I separated from the group and made a series of turns to eventually see sunlight at the end of a hallway. I tried to backtrack where I came from to tell everyone else but I just got more and more lost. Everyone else ended up in this underground mall with a bunch of abandoned retail shops lining the walls. I happened to find myself in one of those shops (I think it was a camera shop) the the front door and window was covered by a security gate so I couldn't get through to the others. Then I vaguely remember a bunch of "men in black" hurding the others away while I'm stuck in the camera shop - I tried to call to them but the noone could hear me.