I swallowed water down "wrong pipe" seemed like a good amount. been coughing and had a swollen throat feeling all day. feel like i'm hacking up liquid. is this something i need to worry about.

Aspiration: You may have aspirated water into your lungs. If your cough persists you dhould seek medical help from your doctor.

Not sure : It may just be swelling in your throat from all the coughing, but if the symptoms don't go away, you should see a doctor right away. Better safe than sorry.

Possible pneumonia: When water goes down the wrong way it is known as "aspiration"- which means it reached the windpipe or lower. Water is generally not that harmful but any substance aspirated can cause you to have inflammation or even "aspiration pneumonia". I would get checked out to see if you need treatment for such a problem. It could just be a cold you have now, but with the aspiration i wouldn't risk it.