There have been several threads, in which many issues regarding the brewing of beer in the DR were discussed.
The following is one of those threads:
Beer Question
And you could do a search using "brewing beer" using the search function on the tool bar at the top of this page. There are perhaps over a hundred threads to read through.
It is a very interesting topic. My suggestion would be to be very careful preparing the water you use. I have brewed beer in the states, and a decent supply of water was an important consideration for me there. It is certainly an major issue here. Water has characteristic traits, which affect the flavor, and in the DR, those traits are usually negative.