Will not start after running for a bit

So, a couple days ago I drove to work and when I went home it wouldn't start for the life of me. I tried everything I could think of, but it just didn't start. It stayed there for two days. Last night my sister got it to start, and we went and put gas in it at a gas station down the road and took it home.
Today I went outside and let it run while I cleaned it. I turned it off to put more coolant in it and now it won't start. Lights come on and when the doors are open it dings but that's about it.

Also, it this has anything to do with it, on my passenger side floor there's pooling of some orange liquid. I'm amusing its coolant because that's the only orange thing I put in my tuck.


Thank you for your help.