Well... Considering the price of a 32 Oz Nalgene is just a bit more than lunch at McDonald's, I would solve this problem with a quick visit to your local outdoors retailer. <img src="/images/graemlins/grin.gif" alt="" />

Sometimes working on an unsatisfactory solution is not worth the hassle. Hey, why not use that Nalgene as a pee-bottle when camping?