Here is a list of kosher food available in Lisbon. This list has been put together by the Jewish Community of Lisbon. It provides you with the most detailed and updated information on this topic: http://www.cilisboa.org/documents/Kosherlist_5775.pdf
If you come to Lisbon for a few days and rent an Airbnb. We can offer you to deliver kosher food directly at your apartment before check-in time or on the first day of your stay.
Moreover, being aware that a second fridge is not a common option in a rental vacation and that you are not able to travel with one in your luggage, we can as well deliver a small fridge to your Lisbon Address.
For these delivery arrangements, feel free to contact us at: firstname.lastname@example.org.