Refreshing Mouthwash
If you happen to get stuck without any mouthwash, just use Hydrogen Peroxide! It kills most bacteria you have and helps eliminate bad breath (although it is inferior to a strong peppermint mouthwash). If you want to use this hack, just mix equal parts of Hydrogen peroxide with water, and swish swish swish, gargle and spit it out. That should be enough for the day!
If you want to make your own mouthwash, make sure you store the mixture in an opaque container. This is really important because the compound could break down if it is exposed to light. Now you can be that person that mixes their own mouthwash, you could even add different tastes and smells to make your breath unique, but in a good way.