It takes more than just the Black Walnut. You should be able to get Clarks Wormwood at a pretty reasonable price. If not, seems there has to be someone, somewhere over there where you could get it.
Three times a day with the Black Walnut is plenty. Add the wormwood to it and you're in business. Also, the bugs hate the hot spicy stuff, especially Cheyenne Pepper. So if you like the hot salsa'a or Buffalo Wings go for it. The hotter the better. The bugs hate it. A couple or more doses of that every day will get them on the run.
Three times a day with the Black walnut is okay. Add some wormwood or other antiparasite products to it and there will be no doubt. You WILL see them