To make the feta: Combine vinegar, water, olive oil herbs and spices in a small tupperware container. Stir to combine and then add the feta. Store in the fridge until ready to use or up to 3 days.
In a small bowl combine all dressing ingredients. Stir to combine and set aside.
In a large shallow bowl, combine sliced cucumber, sliced tomato, sliced onion, capers, mint and parsley.
Pour the dressing over the top and gently toss to combine. Then top the salad with a few feta triangles.
Serve immediately or, store in the fridge for up to three days.