It depends whether they are observing the safety guidelines in the Safer Clubbing Guide. If so, you will get free water, if not, I suggest to go elsewhere as this premises may not be well run and your safety may be at risk.
sadly there is no law which says free water must be given! A pub, club or restaurant isn't allowed to charge for the water but can charge for the glass ie, washing etc. I know this cos I used to work for the tightest Landlord in history!
well i think i shall lobby for a law to provide free tap water IN a glass or another equally appropriate drinking vessel, always get a jug of water in american restaraunts as far as i recall! ah well . . .
Selling drinks is how these clubs make most of their money. A glass of cola costs around �2.50. Daylight robbery. Pubs are not much cheaper either. My coke often costs more than a beer. (Coca-cola that is)