whatever you do don't mix nyquil and vodka/borbon etc if you like your liver.
staying superhydrated is good but don't get hyponatrea.
basically what mike said. gargling with warm salt water is easier than snorting it up you nose though.
vitamin c, zinc and echinacea. echinacea tea. tomato juice/V8. chicken soup. big doses of wasabi, hot peppers and so on will also promote the extra nose running. remember you don't want to get rid of the symptoms - you want to INCREASE the symptoms to get rid of the problem faster.
hot sauna and/or steaming your nose over a kettle of boiling water are other good techniques.
Vicks VapoRub and/or Mentholatum too.
and a couple packets of fishermen's friends. get the extra strong ones.