You might find this new product concept interesting. It's a cup lid
designed for the paper cups used in marathons. Makes re-hydrating on the
run very easy. You can search for it on YouTube by typing "runner's cup
lid" in the search bar.
Just what I needed, I think I lost minutes on hydration stations during my
first half marathon because I don't know that technique. My momentum got
broken during the race but now I got a new technique.