Similar to this previous deal, which was pretty popular. Seems to be valid at all locations other than airports and Southern Cross Station, although there is a full listing on the deal page to confirm.
Vouchers are delivered instantly and can be used through to 10th September. A salad and water apparently costs $9.70 usually, so this deal is about half-price. Enjoy!
The salad and water costs $9.70 because they value the bottle of water at $3.20
So if you dont need a bottle of water, ur basically paying 5 bucks for a small salad/Pasta/Risotto/Curry which usually costs $6.50