If you know someone that lives in Florida that is not taking part in the evacuations, please encourage them to download the Zello app on their phone.
There was a massive uptick in the app's use after Hurricane Harvey in Texas and it works over wi-fi, even if the cellular network goes down. Granted, if you lose power and don't have wi-fi or cellular network, this won't work. But it's MUCH better to be prepared and take as many precautions as possible.
Zello is, in its simplest explanation, a "walkie-talkie" app that allows you to keep in touch via wi-fi OR cellular network. Read more about it here.