How good a plumber are you?
Pipes are pipes, and the pipe threads in argentina are NOT metric, for various weird historical reasons.
So if you bring a filter down, you should be able to find the right adapters and fittings to hook it up.
Might take some back and forth with the plumbing supply guys- I have found them to be pretty easy to deal with assuming you are willing to work with em.
My industrial spanish is basic, but they always bear with me and help me figure out what I need- I didnt personally do all the plumbing in my place, but I have had to do a fair amount of repairs and misc stuff, and its not any different from plumbing anywhere else.
Of course, I keep tools in my departmento, and have been working with metal and fixing buildings for 30 years or so, so it seems pretty basic to me.
Doing it yourself, assuming you have the tools, should be a few dollars in fittings, and a bit of work. Depends if you need to cut and solder copper, or cut and glue plastic, or assemble steel pipe- and that depends on the plumbing already in your place.
If you have to hire it done, expect prices to be commensurate with your naivete- that is, if you can reasonably understand what you want done, and communicate it in spanish to a plumber, and then watch to see that he does it, you will only pay a small "expat" markup over standard prices.
If you have no idea the difference between a pipe wrench and a screwdriver, and you dont speak any spanish, well, caveat emptor.