Hi Helen, I was there in March and seem to recall that a bottle of house wine was about 10 euros and soft drinks weren't too overpriced.
If you are having the meal, just a word of warning
If you are asked at the end of your meal if you want coffee, be prepared to pay extra, it's about 2 euros. It is not included in the price of your meal and a lot of people don't realise until it's too late.
Hope you have a great time, if the show is still "Passion" it's spectacular, I'm sure you'll enjoy it, you'll have to let us know.
Sue