Place water and dill seed in a small saucepan and bring to a simmer over medium-high heat. Reduce heat to medium-low and simmer 10 minutes. Whisk in honey and salad dressing mix, then pour mixture into a large bowl. Whisk in mayonnaise, buttermilk, milk, and vinegar until smooth.
Place cucumbers, tomatoes, celery, onion, garlic, and salt into a separate bowl, and pour half of the dressing onto the vegetables; toss well. Cover, and refrigerate salad for at least 1 hour. Cover and refrigerate remaining dressing for future use.
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