Heet in south america??

You might consider the Optimus Nova or Nova+ multifuel stoves.
I still haven't forgiven MSR for my Internationale failing in Peru. :(
Learn the names of the different fuels for the places where you're going:
http://www.ultralight-hiking.com/fuelnames.html
In Peru, kerosene used to be everywhere, even some places without much in the way of roads.

I have seen alcohol in hardware stores in the big cities, but I would be very surprised if there was anything like that in remote areas short of kerosene and petrol.
Maybe consider a wood burning stove?
I can tell you with certainty that wood will be available ;-)

Here is a list of some other names for it and where you can buy it.
http://www.mark-ju.net/juliette/meths.htm
Keep in mind that usually the supermarket/general/hardware store versions are the denatured kind that attracts a low tax rate, the pure version sold in chemist stores and some supermarkets (for example in Italy and Greece) has a very high tax rate. Both versions are usable.
It is still commonly used as a cleaning/disinfectant agent ( for example to clean glass…) so usually found in the cleaning section.
Don't look for a specific brand, it is a generic product (like flour or vinegar)
Franco