Why wont my car start and leak water on passenger side under the hood.

I did not drive my car last so honestly unsure of how it quick.  I was told that
parking the car water starting gushing out.  Then I was told it was still cranking
but  the person did not drive to my house.  Went back in about two or three
days and the car did not crank and have not crank and my battery is no good
now.  My mama let me use her battery out her truck and it still wont' start.  It act
as if it want to but it wont.  My mama and me feel like something is not allowing
it to power up.  plus it also leaking water on the passenger side under the hood
whenever I put water in the car.  I kind want to say it something to do with the
radiation cause I just replace the radiation because the old one was rusty and
crack and old.  Please tell me whatever it is It can be fix.