Hi,

a camping place will cost between 10-15 EUR. I think for food you need 10-15 EUR per day. (prices for 2 persons). Normal restaurants will cost 15 Eur per meal (incl. 1 drink)
In remote area the camping places are cheaper the food more expensive. With stealth camping and buying the cheapest food you can save more money.

The rest is for sights. Turkey is the cheapest country in cost of living and the most expansive in sights.

In 3 hours in istanbul I spent more than 50 EUR (in total 150 EUR - only entrance fees).

Very cheap you can travel on the pilgrim paths in Spain: 5 EUR per bed and 5 EUR per pilgrim menu.

In big cities check for backpacker hostels (they are normally cheaper than outside camping place + fare of public transportation to downtown).

In general the Mediterrian coast is 100-200% more expansive than travelling 100 km away from it.

Thomas