Of course people should pay for soda water, I'd imagine the landlord has to pay for it? If they want a glass of free water they can have tap water! People hanging about in boozers sipping water for a couple of hours want firing out the nearest window, cvnts!
Not everyone who goes into a pub wants to get pissed everyday, some just want to watch the football and enjoy the atmosphere of being around other people.
I reckon the landlords should give a free soda water to anyone who comes in, and anyones after that should be 20P each. So people don't take the piss and just drink soda water for hours.
I mean it benefits the pub to see more people inside it, especially when most pubs are empty these days.