In a large pot, combine the water, vinegar, salt, and sugar and bring to a boil.
While waiting for the liquid to boil, combine the vegetables, peppercorns, and mustard seeds and evenly distribute into two 32 ounce mason jars.
Add 2 bay leaves and 1 sprig of oregano into each jar and then pour the hot brining liquid over, leaving about ½ inch of empty space from the rim.
If you are planning to use the pickle mix within 1-2 weeks, securely cap and allow to cool before storing in the refrigerator.
If planning to store, fill a pot with 3-4 inches of water and bring to a boil. Place the mason jar in the boiling water and allow the jar to boil for about 10 minutes. Remove from heat and allow to cool and store at room temperature.