What about using those antibacterial no-water hand gels? that would cut down the weight as I would carry a small bottle of that for my hands anyway.
I think that's a pretty good idea, just to be sure. If you aren't sure if your knife is clean enough, your food will taste a lot worse too (purely psychological).
Those no-water gels mainly consist of a high alcohol dosis. So carrying some strong alcohol might work fine too!
