RC, PK shrimp may not do as well for you as the native freshwater Florida grass shrimp would. Palaemonetes paludosus commonly known as the Eastern grass shrimp, Riverine grass shrimp or Florida ghost shrimp is the species of grass shrimp you most commonly see for sale as feeder food in the tropical fish trade. They are very common is most freshwater areas in Florida. Like PK shrimp, they can survive and thrive in freshwater through all life stages. They are less cold water tolerant than PK shrimp though, which is why they are not an option for us northerners. However, where you are they are native and would do quite well. I suspect you shouldn't have a hard time collecting them from the wild. Most ditches and ponds I have sampled in several different parts of Florida were loaded with them.
I am not trying to dissuade you from purchasing the PK shrimp. TJ and I were the first to find a supplier and I stocked them and believe they should be like fatheads, stocked in just about every pond. But, I think the native Florida grass shrimp would be a better option for you... Just my .02.