1999 Dodge Stratus...Please help

I have a question... Not sure what to ask exactly so I will explain what happened. Last night I went out to get some ice cream and had been driving the car all day, but when i went to get my ice cream and was on my way back to my house when the temp gauge started rising. I checked under the hood and everything and there was anti freeze everywhere. Since it was dark I decided to check out my car in the morning and after looking at it the jug that holds my anti freeze was empty and the anti freeze was all over the motor. So i checked all the hoses that I could and put the anti freeze jug to a normal not hot fill. After I had did all this I was going to take it for a ride and see what it did when I heard a little whistle. Once I heard the whistle I listened for a bit and noticed that it would get a little louder and than go away and come back, but it only last a few seconds can anyone help me with this. I have a feeling that the cap on reservoir jug is shot, but can anyone help me with any of this.

If you have antifreeze all over the engine its not the reservoir cap. Theres no pressure in the reservoir. You need to have the cooling system pressure tested to find the leak and have it repaired. The whistle you heard is probably steam releasing through the hole in a hose or somewhere. Just filling up the reservoir tank isn't enough to fill the entire cooling system. There's also air in the system that has to be bled out before it's full. Don't keep driving it like this or you'll blow that little 2.4 L.