My dad and I are taking a trip to the 100 mile wilderness in a few weeks. He is hellbent on bringing his katadyn vario (I belive) filter. He knows it screws directly to a nalgene... The problem is that neither of us carry nalgene in the summer, and don't want to. We both take platypus, I have been to both websites and don't see an adapter. Is there a way that I can rig this connection. Having never seen the filter the only thing I can come up with is connecting a short piece of flexible hose to the filter and a cap that screws onto the platy. Is this possible? OR please tell me I missed the product on the web and point me in the right direciton?