This video shows a really neat way to make a homemade hair bungee (non-homemade version to the right). The homemade one does the same thing as the one you can purchase (watch the video). This is especially useful for my H&H sisters with thick hair...ENJOY!
He demonstartes a good way of getting a sleek ponytail with no sagging in the back. I don't know about the warm salt water part, but everything else I can get with.