I get hit with it, too...especially at night! I keep a glass of ice water by my bed...I usually end up awake and chugging it at some point...and then am up to pee a couple of times, too.

I drink the water filtered through our fridge (Kenmore...have no idea if they use a different brand filter or not?) and have bottles I keep in the garage fridge for when I go out.
This thirst is nothing compared to the thirst I get when nursing a newborn though...oh my land! I'll probably have to bring the hose in through the bedroom window.