Marinated Cucumber, Tomato and Onion Salad

Instructions
Assemble all necessary ingredients.
In a large mixing bowl, combine water, distilled white vinegar, vegetable oil, sugar, salt, and pepper. Whisk until the mixture is well blended.
Add the sliced cucumbers, wedged tomatoes, and separated onion rings to the bowl. Stir until all ingredients are evenly coated.
Cover the bowl with plastic wrap and place it in the refrigerator for a minimum of 2 hours