I went to Spain for a month with my boy when he was 9 months old. We took sterilising tablets, and just bought local food similar to what he ate and drank at home. Most hotels and restaurants will at least give you boiling water if needed. I'd google/research local supermarkets and see if they have any formula similar to your little ones. Just so you don't need to take too much in your luggage. I drove the whole way to Spain and back, so can't comment on a flight for such a young age. Recently just spent a week in Spain, flying there and back, with my now 16 month old. Found it more stressful than driving in my personal opinion. Happy for you to message me and ask any questions ☺
We are goin to club mac alcudia in May, went last year. U can hire tons baby items in hotel, like a steriliser. We also took steriliser tablets and sandwich bags sterilise bottles. The restaurants had blenders to puree food and we look some pouches from home in suitcase and kept in fridge in room. They have microwaves and hot water machines on each floor so can warm things/get hot water 24/7
With my first we used the Milton sterilising tablets in a bucket...it was really easy to do! Can't recommend hotels/SC as that was 6 yrs ago now, but I would suggest SC may be easier as u will have a kitchen area....Good luck Xxx
If you are going to Spain take the formula from here. They don’t have the same milk and also more expensive. Same with nappies.