Water leak needs help

Hey I got a neon wit many problems i have a water leak and dont know where exactly it comes from i know the from driver sidefill with water everytime it rains but there is water in the back too and i cant find the source i removed the carpet and still cant see it.
I need a new motor mount, the engine light stays on it idles irratically, the front end is damaged slightly on the drivers sidemost of this i can fix but is it worth it or should i trade it for what ever i can get.?.?