The following homemade mouthwashes will help you to eliminate bad breath and promote overall mouth and gum health. Homemade Spearmint Mouthwash: 6 ounces water, 2 ounces vodka, 4 teaspoons liquid glycerine, 1 teaspoon aloe vera gel, 10-15 drops Spearmint essential oil.Boil water and vodka, add glycerine and aloe vera gel. Remove from the heat, let cool slightly. Add spearmint oil, shake well. Pour into bottle, cap tightly.