Had an ice storm hit my neighborhood several years ago. No power for 13 days. I kept 30 Rainbow fish alive in a 65 gal
tank by changing 10 gallons with warm water twice a day. I kept the tank covered with a blanket to conserve heat. I didn't have a battery bubbler. I fed them once every third day.
You might do 2 or 3 small WC
's a day with as cold a tap water you can get. With the airstones most fish can survive water temps to the upper 80's.
Folks here in Oklahoma are praying for Florida. Good luck.