Neti pots are really nifty things. I got mine from the health food store, but you can get it from Amazon. They look like this:
Mine holds a cup of water (I use it slightly warmed) and I use a small amount of Himalayan salt in mine, well dissolved. I actually make one batch up and pour it through a nostril (there's videos out there of how to do it - you sort of lean forward and tip your head to the side so it goes in one nostril and out the other) - then I make a second cup up for the other side. You could do it with one pot, I just couldn't figure out how to measure 1/2 a cup when I'm pouring
You could add an activated drop of MMS to it, if you like - Good thing!