Both places I have worked here have water coolers in the office & people fill up their cups again & again all day. (As well as drinking tea, coffee, juice, squash, etc) But I have noticed some Brits don't tend to drink as much with their meals. My in-laws always put something out - water, wine, or a soft drink as to everyone's personal preferences, but Steve isn't at all bothered if he doesn't have anything to drink with his meals so I've found I often don't either now. But I will get myself something if I really want it, to go with my meal..