Boy oh boy have I been there!
Netty pots do work, and you can just use a cup with saline water instead of an actual netty pot. Check out the internet for instructions. We just lightly snort the warm salt water into our nostrils, only taking in enough to get into our nasal passages and not inhaling it enough to choke on it or breathe it in. Sounds weird and I'm not sure I'm describing it well, but if you can do it then you don't have to run out to buy a netty pot.
However, what I think is really much better than anything else is a hot steam vaporizer. The humidifiers (i.e., cold vaporizers) don't work for me, but I've used a cheap Vics brand hot steam vaporizer now for years for me and for my young kids. They work great and are perfectly safe for pregnant women. You need to be careful to keep them out of the way of kids since the water does get hot. Not boiling, but hot. Since you are in Spokane, it tends to be pretty dry so the extra humidity should help you feel more comfortable. BTW, some people freak out about the black stuff that shows up in the water. It is actually the minerals that are actually in the water anyway being precipitated out. It isn't mold, even though some people are afraid that it is (apparently they don't think about the fact that it is gritty and mineral feeling and not organic feeling at all). Anyway, can't recommend the hot water vaporizer enough. Good luck!