Bring an empty refillable bottle for a long train journey
Station and onboard water is priced for a captive audience; the platform tap isn't.
Why it works
Bottled water at a station kiosk or onboard trolley is priced several times over a shop price, banking on there being no alternative once you are travelling. Most stations have a free water point on the platform — filling an empty bottle there before boarding sidesteps the markup entirely.
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