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The taste of the water in some parts of London or even in some buildings might be unpleasant. Some folks might find comfort in knowing they won’t suddenly be left without water (eg old folks with limited mobility, rather than preppers). There also seems to be various cultural elements related to it: snobbery, distrust of water companies, beliefs about cleanliness.
It’s a real shame that so much plastic is being used for disposable bottles in a city that has potable water everywhere.
Loads of people. All the Turkish shops near me have six packs of 1.5l bottles stacked up by the door and you see plenty of people buying them. God knows why.