Malagueta is the most popular, and famous, chile used in Brasil. It is a C. frutescens; it is very hot. It is quite similar to our standard USA tabasco chile, and also to Zimbabwe Bird. Red ripe ones of these would be the most suitable substitutes, next would be any other ripe C. frutescens, e.g. the various Thai chiles, next would be any ripe hot C. annuum particularly pequin or cayenne, and finally, as always, you can always substitute any other hot chile of your choice. The "brine of grain alcohol and oil" business of course probably won't be locatable in USA except if you make it yourself. Personally, I'd just use fresh ripe tobasco or "Thai" or cayenne chiles and leave it at that. --- Brent