I would say: There is a hole in the bottom of the milk carton and all of the milk that was left leaked out.

A few word changes to make your entry sound more natural.. Just a minute go , I DISCOVERED that the bottom of a milk carton in the fridge WAS ripped and the rest of the milk that was left in that carton HAD leaked. I'm just wondering if it's CORRECT to say " The bottom of a milk carton is ripped " . or Should I say " The bottom of a milk carton is torn " ? Which one sounds natural ? or is there another way to say naturally ?

I think either is ok, both sound natural.

"The bottom of the milk carton is torn/ripped" sounds a bit stiff. A more common way of saying is to simply say "The milk carton is leaking." or "There's a tear in the carton and it's leaking."

lol wrong area still new to this app