Combine the vinegar, sugar, and salt in a small sauce pan over medium heat. Whisk until all ingredients are dissolved. Remove brine from heat and add cold water.
Prep mason jars by dividing dill, mustard, coriander, garlic, and cucumbers between the two jars.
Pour prepared brined into the jars until cucumbers are covered. Cover jars and keep in refrigerator up to 2 months. Pickles should be ready after 24 hours of refrigeration.