In a bowl, toss together vegetables. Sprinkle with some salt and pepper.
For vinaigrette, in a screw-top jar, combine water, sugar, vinegar, and oil. Cover and shake well. Pour over tomato mixture. Toss to coat. Cover; chill for at least 1 hour or up to 4 hours, stirring gently once or twice.
Just before serving, transfer to a serving bowl with a slotted spoon. Sprinkle with bacon. Makes 6 side-dish servings.