1 cup of 99% isopropyl alcohol
1 tablespoon of 3% hydrogen peroxide
1 teaspoon of 98% glycerin
¼ cup, 1 tablespoon, and 1 teaspoon (or 85 milliliters) of sterile distilled or boiled cold water
1. Pour the alcohol into a medium-sized container with a pouring spout. The percentages on the labels of isopropyl alcohol refer to the alcohol concentration in them. You’re dealing with almost pure alcohol if you’ve got 99.8%, whereas 70% means the bottle is only a little more than two-thirds alcohol, and the rest is water.
Note: Some formulations have tried to adapt these proportions to use 91% isopropyl alcohol or even 70%. But these alcohol concentrations will render a final product that doesn’t comply with the Centers for Disease Control and Prevention’s recommendation of using hand sanitizers with at least 60% alcohol to fight COVID-19.
2. Add the hydrogen peroxide.
3. Add the glycerin and stir. This ingredient is thicker than both alcohol and hydrogen peroxide, so it’ll take some stirring to combine everything. You can use a clean spoon for this or, if your container has a lid, you can put that on and shake it well.
4. Measure and pour in the water. If you’re using 99% isopropyl alcohol, you’ll need to measure ¼ of a cup, 1 tablespoon, and 1 teaspoon of distilled or boiled cold water and add it all to your mix. If you’re using another percentage of isopropyl alcohol, just pour as much water as necessary to get to a final volume of 345 milliliters, or approximately 1.4 cups. Stir.
5. Sanitize your spray bottles and pour in your hand sanitizer. Spray some of your leftover alcohol into your bottles and let them sit until the alcohol has evaporated. Pour in your sanitizer.
6. Label your bottles. You don’t want any accidents where you or anybody else ingests your newly made hand sanitizer. Take the time to label your bottles. Go kill some germs.