Step 1  - Sterilize equipment.

First, sterilize the amber glass bottles, glass measuring cup and stainless steel spoon. Do this by bringing a pot of water to boil and then shutting off the heat. Place the bottles in the water and remove after a few minutes. Place on a clean surface. Repeat with the measuring cup and spoon.

Step 2 - Prepare the water.

Distilled Water Method: Place the distilled water in the glass measuring cup. Or if you're using boiled purified or spring water, follow the directions below.

Purified or Spring Water Method: To sterilize purified or spring water: Sterilize a clean, small saucepan by boiling some water in it and then discarding it. Inside the same cooking pot, place the 1 cup purified water or spring water. Bring to a gentle boil, then shut off the heat and let it cool.

Step 3 - Add the sea salt & optional baking soda.

Add the sea salt and baking soda. Gently stir with the sterilized spoon. Let the solution cool to room temperature and then pour into the sterilized amber glass bottles. Screw on the nozzle lids.

Step 4 - Store solution

Keep 1 bottle at room temperature for up to 24 hours. Store the remaining bottles and solution in the refrigerator. Bring solution to room temperature before using. Discard any leftover refrigerated solution after 3 days.