my engine shut off and now it wont start after I heard a rattling sound

What is your question?

I felt the radiator smelled like it needed water I put some in it was hot I know cause the water bubbled back on me when I got it calmed down I put the cap back on started the car and proceeded home when I heard a sort of rattling sound I went about another three or four miles and the engine just died and would not crank back up oh there was a leak earlier but it wasn't large it was water

What makes this problem better or worse?

its worse when engine is hot

How long has your 2008 Hyundai Elantra had this problem?

a day