Whenever I have a runny nose the way I get rid of the runny nose is to take some non iodized salt and make a saline nose rinse solution and use a Neti Pot to rinse my nose out.
The runny nose will usually stop after doing a few rinses of the nose using the neti pot and saline solution.
Also taking a steamy shower or just sitting in the bathroom with the shower on using hot water to put out steam seems to clear a runny or stuffy nose for me.
Be sure to stay well hydrated as well.