I agree completely. Do you attend public or private school? If it's public and they have completely abandoned the selling of plain bottled water, I would write to the head of the school district and your local newspaper to complain.
I think it's the soda industry's way of trying to keep their grip on school vending machines and the school system's way to keep their cut of those profits.
Remember, many cities have required that their school systems be banned from selling soda. These districts were basically in bed with the soda companies for a cut of the profits to go to the district for funding. Without soda, they were screwed, as they knew kids wouldn't just buy the bottled water after being hooked on the soda.
Vitamin water and flavored waters have the guise of being "healthy options", yet they still have the chemicals and artificial sweeters that have unknown/untested long-term health effects.