Commercial mouthwashes typically contain weird ingredients and alcohol. My homemade version uses only standard pantry ingredients and costs only pennies to make! Use a repurposed flip-top jar and you have made another step toward your zero-waste personal hygiene routine! (Check with your dentist if you have any reservations about homemade dental hygiene products) ~TMH~
In my pint-sized flip-top bottle I add 3/4 cup filtered water, 1 tablespoon baking soda, 1 teaspoon powdered stevia sweetener (optional) and about 4-5 drops of mint essential oil. I flip the top closed and shake thoroughly.
To use, shake thoroughly & pour a small amount of mouthwash into a small cup. Swish thoroughly through all your teeth and spit mouthwash into sink. I like to swish with a little clear water afterward.
I store my mouthwash in my bathroom and have had no trouble provided I use it quickly since it contains no preservatives. But for safety's sake I'd recommend storing in the refrigerator and using within a week or two.