Did you know that the bigger shops (weapons, amoury) accept credit cards?
Very nice or terrible, depending your point of view.
Considering food: Some very tasty snacks are offered in the city. They range from ~2€ (crepes; tasty pastries) over 3,5€ (potato wedges with super dip o 1/2 grilled chicken) to 5€ (some kind of hemp kebap). You'll always end of buying more of this stuff than you expected, especially if you haven't yet tasted everything and everyone is advertising different stuff^^
Good news: Free drinking water is available and the best in the heat we'll hopefully suffer.