I will start.
I bring a food container with detergent only for emergencies, refuse to wash clothes on holidays.
I also bring dishwasher tablets in case there aren't enough in the villa.
Ditto a starter roll of toilet paper as the last time it was like sandpaper.
This is not done out of meanness, this is because to my mind foreign supermarkets are for oohing and aaahing over the different foodstuffs and drooling at the fish counter.
A holiday is not for turning down the aisle of mundanity in the supermarket and buying the above. They come with us every year and they come home again, they are well travelled. 
DH has stopped arguing.
Only took 34 years.