I guess your food budget depends on where you choose to eat, if breakfast is included with your accommodation and how much alcohol you drink.

At a rough estimate I would look at a minimum of $50 each per day (strict budget) although probably at least double that if you include alcohol.

Take duty free alcohol with you, buy mixers from the supermarket where you can also purchase snacks etc. to help keep the expenditure down. Many restaurants take credit card so you can always enjoy a lovely meal out without using your "travel" funds.

You haven't said where you're staying - Hotel or location - so not sure what, if anything, is included in your ticket or where you can go for locally to eat, etc.

Catherine