PVR Cinemas — Water bottle over priced

I took a pvr dive 500ml water bottle from their f&b counter at panjagutta pvr, next galleria mall hyderabad. The water tasted, utterly poor and was like some tap water filled in a fancy bottle. I paid nearly 40rs for dis 500ml mineral water. At public places 500ml water is charged only 10 rupees but why pvr is charging 40 rs ??
I want to file a complaint on them