Here are a few links to stimulate your thinking about saving water and converting to more efficient irrigation systems. At the bottom of ths post is a site with some good graphics and kits you can study and a link to a new post from http://floridabackyard.org/ that shows you how to do it and how it actually works. Kits are available online or you can get similar kits and components at your Florida Home Depot. The water you save will be worth the effort and expense. Planning is key. You can modify these setups later and add to as you expand but it is more efficient to design it right before you start.
Typical sprinkler systems are very inefficent. The University of Florida did statewide homeowner surveys of existing systems and found that the majority of waste comes from poor design. Only 25% were designed with proper spacing and overlap. That's a lot of waste! With the cost and value of water you might consider an expert for your sprinkler, drip or micro spray design but even then it may not be as efficient as you need. Set up straight sided containers of equal sizes in grids and catch water from a 20 minute run of an existing zone just to get an idea of how to measure uniformity.
Lawn Sprinkler Selection and Layout for Uniform Water Application
Drip irrigation for individual plants is effective but you have to design it properly and calibrate run times and duration so you are not wasting water while using an efficient system. Low volume spray jets may be what you need depending on the size of your targeted plants and considering the sandy soil that lets the water seep vertically so quickly. Drip irrigation can be very effective for landscapes that are planted from gallon size containers if the drippers are properly placed.
Microirrigation in The Landscape
Landscape Irrigation and Fertilization