You could automate your water and not feed your cham for the week while you are away. If you have an adult cham that is otherwise healthy, there shouldn't be any ill effects. Weighing this up against the chance of over supplementing, over feeding and various other variables caused by putting your chameleon in the hands of someone who doesn't know what they are doing and doesn't like the job of looking after your cham, I know what I'd rather do.
I'm not leaving my chameleon in the care of my parents again for this very reason. I came home to find about 40 large black crickets in the cage with the chameleon, which my parents had went to a pet shop and bought in panic, after worrying why my chameleon wasn't eating much. I had divided crickets in boxes of ~6 crickets for each day I was away and had put in a substantial quantity of pupating wax moths inside the cage. I was only away for 4 days and the cham probably would have been better off without their intervention
Last time I went away, I had a friend who lived in my street come round twice a day and water + feed the cham. Th cham hardly ate anything during that time as he loses his appetite sometimes while shedding but I felt the chameleon was in better hands even though my friend had no prior chameleon experience. Next time, I'll just have him come round 3 times a week and feed the cham as my water will be automated by then. If they can check more often, great.
Another option is to put some pupating wax or silk moths in the cage and let them hatch but that is very uncontrollable and you don't really know how much you are feeding the cham. You could also let something else pupate inside the cage, like house flies or blue bottles but same issues as with moths.
Alternatively, there are quite a lot of Florida based keepers on here and one of them could look after your cham. That's probably what I'd do if I lived there knowing how good some of them are.