Collect your plant material.
Wash them first to get rid of any dirt and pests.
Place the herbs in a large clean pot.
Fill the pot with distilled water until you just cover the plant material.
Place a bowl in the upper pot, on top of the brick, or steamer.
Make sure your collection bowl is not sitting in the water.
Place the lid on upside down.
Place a bag of ice on top.
Bring the water to a boil then reduce the heat and allow it to simmer on the stove, checking every 15 minutes.
Replace the ice as needed.
Pour it into a spray bottle and set it in the refrigerator.