Buy a bottle of olive oil and a bottle of vinegar (a fancy vinegar if you want, apple cider or balsamic, but not malt) then buy a packet of Italian spices (typically a blend of oregano, thyme, etc...)

Buy some salad greens, either a head of lettuce, or a box of spring mix or similar blend of greens.

To make salad dressing mix two parts oil to one part vinegar, put in a pinch of Italian spices, a pinch of salt, whisk.

Then pour over your greens, add some feta cheese olives and baby tomatoes, capers if you want.