M.C.
Lots of extra water will help. (Good anyway for pregnancy.)
Most herbal teas are safe. This site gives you a bit more info, along with a list of teas and their benefits/risk factor during pregnancy. http://americanpregnancy.org/pregnancyhealth/herbaltea.html
A non-medicated saline mist might help as well, for times in between the neti pot.
I also slept with those anti-snoring nasal strips (I think I liked breath right the best.), and hung out with them on when I was home. They helped a lot!