Prompted by a sign at the train station telling people to always carry a bottle of water with them in hot weather.
I'm rubbish at drinking water, I find it very boring but I try to drink a bottle (500ml, or very occasionally - if its hot, 750ml) a day, mainly to stop me drinking other unhealthy drinks, and in the hope it is doing some good. The only noticeable difference is that I need to wee more often. I don't always have a bottle of water with me on the train though.
My teens are much better than me at drinking water. Dd often takes a small chilly bottle (I think its 250ml) if she goes out. DS drinks water at home or with meals but would only take a water bottle out if he was doing sport.
But I've noticed people with gigantic - like 2 litre - water bottles, sometimes a parent carrying multiple ones for children.My (adult) nephew had one with him the other day at a family BBQ.
But what started it? When I was a kid I never had a water bottle when I was out. (And we didnt really have it at meals ) Then sometime between then and now bottled water became a thing, now I think more people have reusable, much larger, water bottles.
As long as no one is forcing me to drink more water (or asking me to lug around their 2l bottle) then I've got no problem with it, but I'm curious how or why the amount of water we need to drink seems to have increased. (In other ways people are less healthy than in the 80s, but I'm sure "we" drink way more water...?)