I put water in my 97mustang and when I pull my oil plug water comes out as fast as u put it in

That goes a little bit beyond a blown head gasket. You may have a cracked block or intake manifold or leaky water pump/timing cover. The intake manifold could leak into the lifter valley then into the oil pan. What motor do you have in your Mustang?

V6

I had this problem in my stang starting in March of last year 2016 and just had it fixed yesterday. My car is a 1996 Gt Convertible, we thought it was an array of things from the engine oil cooler to the head gaskets but it turned out rather small, the freeze plug under the timing chain cover had a pinhole of rust enough for the pressure to knock it out, letting water go down almost instantly into the oil pan. I hope this information helps you! It cost me $211 to fix.