NO! water is the best thing for you. water has no calories, no sugar, and the the world will never run out of it. (well if the water is poisoned or contanamated then it would be bad) Our bodies are...
It contains few ions. Dirty water conducts electricity very well. Or Salt water. Pure water has no solutes and lacks ions usually associated with solutes.
Hot water shouldn't be bad for water filters. There is a company that specializes and sells water filters www.freshwatersystems.com. Check it out, it's a great site. They are the leaders in the water...
Lots of things like drowning people, Floods, tsunami's, heavy rain, dirty water can get you sick, mud slides (you need heavy rain for that to.) etc. Alot of things really.