In terms of food and accommodation, Morocco is pretty cheap compared to much of Europe and the USA.
You can expect to pay about £10/£15 a night in a basic hotel.
Food is also pretty cheap, you can get away with spending around £5 a day if you're thrifty.
Alcohol is not so cheap in Morocco in comparison. A can of beer for example, will cost about £1 from a shop and about £2.50 in a bar.
It's probably best to budget in a couple of hundred quid, although it's likely you won't need it.