Due to legal regulations, you will have to pass through several security checks whilst going through the transfer process. Please be prepared for this and pay attention to the regulations regarding taking liquids with you: max. 100 ml containers in a re-sealable see-through bag with no more than 1,000 ml in total.
Please be aware that liquids bought from duty free shops at airports outside the EU may not be carried in your hand luggage when flying from an EU airport. This also applies to duty free items you’ve bought on board a non-European airline. You can, however, place these in a separate, secure container within your luggage before checking your luggage in.