Arrange potatoes in a single layer on clean white paper towels in the microwave. Microwave on 100 percent power (high) for 5 minutes. Turn potatoes; microwave on high about 3 minutes more or until tender.
Place cauliflower and the water in a 1-1/2-quart microwave-safe casserole. Microwave on high for 5 minutes or until crisp-tender, stirring once. Drain. Cool slightly.
In a large serving bowl combine potatoes, cauliflower, onion, and celery. In a small bowl stir together dip, lemon juice, and salad oil; gently toss with potato mixture and fold in blue cheese. Chill for 1 to 24 hours. Just before serving, top with parsley, bacon, breadsticks, sea salt, and pepper.