I used to use a Neti pot, then the allergist suggested the
NeilMed Sinus Rinse bottle. I find the bottle works much better, fits in my medicine cabinet or a drawer better and is easier to take with me if I travel. I've used both their pre-mixed packets and made my own wash using sea salt or sea salt and baking soda. The allergist told me that if I don't need the full contents of the bottle, I can set it aside and use it for up to 2 days. (NeilMed says to throw out any unused solution immediately.)
Good luck,
Julie