If all you are doing is processing 35mm and 120 film and you have chemicals, tanks, reels and a changing bag--you're set. Rinse the film with a couple of tanks of bottled water after fixing, use a hypo clearing agent and do the film soak thing instead of using running water. Everything else would be your standard procedure.
I would suggest two things. Buy a residual hypo test kit and run a home test on your film processed this way to be sure the water soak procedure is working. Also, if your changing bag doesn't have an internal frame, get one.
Although this is more hassle than I would want while traveling, it shouldn't be too hard to accomplish if you're willing to take the time and effort. Good luck.