I wouldn't say that food & drink in Arillas were expensive at all - My most expensive meal was €26 and that included one dish itself being €14.. but it was seafood.
Dining somewhere equivalent in the UK would have been around the same, if not more.
A local italian restaurant local to me costs around £60 for 2 people, 3 courses & wine!
A 3 course meal, retsina, water & a baileys frappe in Arillas.. was well worth the €26 in my eyes - not forgetting the beautiful views you get for free (well, that's only if you don't count the cost of the holiday! haha)
I took €510 with me - this lasted me throughout the week, including a €55 transfer, 3 organised days trips and 2 trips of my own, €25 to keep apartment an extra 5hrs, food, drinks, icecream, 1 or 2 (okay maybe 5) trips to the bakery lol, gifts etc.. I know this post is about food & drink but being able to have the week of bliss that i had for €510 is money well spent to me.. one of my best holidays