Recommended coolant type

Nowadays there is no longer agreement amongst manufacturers, hence they each have come up with slightly different answers and that's why there are so many versions and colors. Most use closed systems and have no copper or solder in them.

Jax is in Aruba, a Dutch island near Venezuala.
IMO his best choices will be products that do not need to be specially imported.
A locally available corrosion inhibiter and lube product along with the appropriate water (distilled or whatever is recommended) would be sufficient.