That is what my wife says, as she is one of those who buy bottled water despite being present when the Royal Marsden stopped my garnddaughter having bottled water as it is not ads pure as the water that comes out of the tap. I never drink just water I always have to add squash.
I am surprised to read that somebody was stopped bringing in a coke I do it at every game, 2 for £1 in Poundland, and have never had any problems once the top is removed.. However, are you permitted to bring in drinkers with tops like the ones sold in Sports Direct not looking like a bottle...