From our experience, the WDW/LBV water can effect people -- and animals.
We use to vacation here. I found out at the end of our first week long trip that bottled water is a safe bet.
After that, I stuck to mostly bottled water on trips and was fine.
The first of this year we relocated to the Orlando area.
During the transission, we lived in an apartment near the intersection of International and 535. (Around the corner from LBV Outlets.)
I found soon enough -- don't drink the water. Not only that -- the tap water effected the dogs! Luckily I was not working at the time and could take them out -- often!
After a few days I switched them to bottled drinking water and all was fine.
We moved to a small community north of WDW, and we have no water issues here, as far as drinking tap water. (DH has been a water snob for years and always drinks bottled water, period. Our frig has a filter for drinking water -- if that really does anything.)
I don't know what the WDW water source is. But in LBV it was no better. It may be the same source.
I know when it hit me the first time I attributed it to over tired, eating off schedule, anxiety, etc. Maybe even a little virus. Now I am sure it is the water.