There's some good advice here. A pump filter is going to be your best bet. The best way to remove nasty piss taste is with a a carbon filter. Here's what I would do:
1. Filter through your sawyer or katadyn hiker
2. Drop a few drops of bleach just to be sure (iodine will work but tastes like shit and bleach will gas off after a few hours).
3. Run finished water through a charcoal filter to remove bad taste.
4. Enjoy
Katadyn vario has a ceramic, cartridge, and a charcoal filter all in one. This may be your best bet. Bring replacement filters and charcoal in case it gets clogged up.
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