Draining the WIF on a Dodge is easy. Should be in the owners manual for your Chevy. I would consider having the tank emptied. Some places have a suction ability for people that accidentally place Unleaded in their Diesel. I would properly dispose of the bad fuel. Don't try to clean it.
When draining the WIF, if possible drain into a clear container to make sure there is water. It may take some time to separate. When at home I temporarily place an old heater hose over the WIF drain line. This keeps it from dripping on the front axle. I would not drive any further than the next exit to at least temporarily drain the WIF.