Liquids in containers larger than 100ml generally can’t go through security even if the container is only part full. There are some exemptions.
https://www.gov.uk/hand-luggage-restrictions/overview
Or:
The Department for Transport does not prohibit the carriage of empty water bottles through security in hand luggage
https://www.caa.co.uk/Passengers/Before-you-fly/Baggage/What-items-can-I-travel-with/
Go figure...
Last edited by t1grm; 1st Aug 2017 at 05:37.