Hi brooke, sorry, but to me this whole project looks out of shape at the moment. Some thoughts -
is it wise to use - or be seen to use - a stove anywhere outside a campsite in a country that has experienced such terrible fires recently?
Have you looked at any back-packing forums about the difficulties in taking any kind of cooking stove/gear on a plane, even without fuel?
How many dehydrated meals are you planning to bring? Food in Portugal is cheap and fresh and often very tasty. Bringing and using meal bags in Portugal is a bit weird, detaching you from the local world that you have come all this way to experience.
Does any backpacker nowadays need to use gas canisters? Make or buy a simple alcohol burner if you really have to have a cooker. Methylated spirits is available in hardware stores and often bioethanol too nowadays. But really, unless you are staying at campsites, I'd think again about whether you really need a cooker at all.
My strategy (which may well fall over when others comment!) would be to aim at having a local hot main meal in the middle of the day or evening, depending on availability. And the rest of the time carrying bread, groceries, fruit, yoghurts etc and supplementing with tasty snacks in any cafés or bars that you find in between