He stated: “This is an obvious trick but it’s one that many people miss.
“The airports know you’re a captive customer and they can charge £1.50-£3 for bottle which for a family of four is expensive.”
There is also no automatic right to tap water on a plane, the expert continued, however, “you’re allowed to bring an empty water bottle through security”.
The money saving expert listed the following UK airports as having water fountains: Heathrow (all terminals), Gatwick, Manchester, Stansted, Luton, Edinburgh, Glasgow, Bristol and Southhampton.
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