You have asked this question a couple of times so I'll try to help you but please realize that this is not my expertise. Working in power plants and owning rental properties I have a little experience in this. (but just a little)
We used to build concrete block wall with the blocks offset (not smooth) around transformers to lessen the sound for neighbors. Finding "real" sound proofing supplies in Belize may be difficult so here are a few ideas that you maybe able to do with common building supplies. Here is a website that explains a little of it. http://www.soundonsound.com/sos/may08/articles/soundproofing.htmYou maybe not be able to do what is suggested but here it is.
Build block walls inside your home for the sound proof room. I believe offsetting the blocks will help. Inside that room build another room with as much space as practical between the walls. Maybe 2-3" or more. The inside wall could be block or a regular wood frame wall. A few layers of sheet rock on each side would be good. Do not allow the walls to touch the other wall or floor unless you use a piece of rubber or heavy silicone between them. Fill the space in between with dense insulation. Styrofoam blocks would be OK I would think. This is where real sound proofing would be used. Build a floor in the room which is insulated by rubber from the present floor and do the same with the ceiling. The idea is to reduce vibration between the walls, ceiling, floor. If they touch the vibration (noise) with transfer. The offset blocks redirect the sound and absorb it.
Look I've never built a room like this so I not 100% sure of the results or method. Also pay very close attention to the door and window if any. Better not to have a window. Caulk everything along the way. Maybe this amateur answer will provoke some more suggestions which may help you out with the materials available. Good Luck. There are some very good sound proofing material in the USA which you could send down here I guess but I don't think you want to go the expense and trouble. This may give you some ideas. http://www.acousticalsurfaces.com/blog/s...-and-absorbing/