Bring water to boil and add farro. Cook over low-medium heat, until water is dissolved. Remove farro from heat, allow it to cool down a little, and then refrigerate for at least one hour.
In the meantime, in a medium mixing bowl whisk together olive oil, lemon juice, Italian seasoning, salt, and pepper.
In the same bowl add cucumber, tomatoes, onion, parsley, sun dried tomatoes, olives, feta crumbles and boiled farro. Toss ingredients well together.