It's time to spend $3 at wally world for a gallon of RV anti-freeze. Dump that gallon and 3 gallons of water in a 5gal bucket.
Dump some in each livewell, and the rest in the bilge with the plug in.
Run livewell pumps, Run bilge pumps.
Drain or not...doesn't matter.
If already frozen, use hot water.