There's absolutely nothing toxic about Florida water. Some areas may have a funny taste (WDW and Tampa come to mind), but the water is from the various aquifers and is very good water. The problem is that the storm could damage the treatment plants for municipal sources of potable water, allowing contaminated water to leak into the supply. Pumping stations could be damaged. Water towers destroyed. The City of Tallahassee gets most of its water from wells and if pumps are damaged, it will be hard to get water out of those wells. So lots of things can prevent residents from getting any or safe water when they turn on the tap. Hence the mad panic for bottled water. And you'd be surprised the number of people on private well water - not that uncommon here in North Florida.
), it's a little hard to read but it's the clearest representation I've seen so far for Central FL...it shows the Euro model and GFS model overlapping. The dark pink circle in the center is the ECMWF, with the GFS slightly to the right and closer to the coast, the smallest white circle. They are forecasting that Central Florida might have Cat 4 winds. 
