If you bring an empty reusable water bottle to the airport and want to fill it with water, you can do so at several places. In the departure hall, you can refill your water bottle for free at EXKi. In Gates A, you can refill at Grab & Fly or the WHSmith shop. Immediately after the security check, you'll find a free water kiosk. This facility allows you to refill your empty water bottle after passing through security. Don't have a drinking bottle with you? No worries! You can also buy a water bottle there.
Good to know: Your water bottle does not need to be empty when you board the plane. It only needs to be empty during the security screening.
You can buy water bottles at WHSmith (Gates A) or, as mentioned earlier, at the water kiosk located after the security screening.