Info on neti pot...Like the person above I do mine over the sink as well. I do use the packets that come with it, and regular tap water. I wouldn't have the patience to make it. Also, make sure you have a box of kleenex..
I did look for videos on homemade neti pots... It looks like it would be a pain in the ***.. so if you can afford to buy one.. save urself some hassle.. although you may be able to find a small cheap tea pot, and then make the solution as described above...