you can do whatever you want in your free time
so if you want, just go to the souk and enjoy your shisha (or whatever they call those things haha)
and well you can bring as much food as you want but make sure its not against customs and country rules (e.g. NO PORK) . i bought some silly stuff that i thought i might not find here myself, like chilli beans powder, my favourite biscuits, sweets... so i guess its alright. but actually its pretty unnecessary coz you find almost everything here.. so dont pack stuff like canned beans/peas/vegetables.. luncheon.. fruits... whatever
i hope you see what i mean. you arrive, you go out on the street and im sure you'll find at least one grocery store right there.