We kept our costs down and spent less in three weeks this year than we normally spend in two by having the odd takeaway, especially the lovely Turkish ones instead of steaks every night. We still went out afterwards.
We went to the Florida a few times for breakfast which was 4 TL which was excellent value as well as tasty but most of the time we bought bread from the bakery. The best value meal we had was in the Blue Fox which opened this year. It was a seven course meal. I had the bread & mezes starter that they usually provide, followed by tomato soup, main course, apple pie, fruit, coffee and then a lovely liquor. If your main course was chicken the meal was 22 TL, if a steak I think it was 26 TL. Quite a few restaurants have set meals but we found this one the best.
The price of drinks varies a lot as well. Whilst we were there the cheapest efes was 2.5 TL in Mr Cook but later it went down to 2 TL at the Buffalo bar. Even though it was only 4-5 TL in other places it makes a big difference to the cost of the whole holiday. But there are so many excellent bars to choose from.
If you're self catering you could also go to the larger supermarkets in
Marmaris at the beginning of your holiday. There's even a Tesco there now under the name of Kipa.