There were over 700 confirmed cases of the coronavirus in the United States as of March 10, according to NBC News. To prevent COVID-19 from spreading, the Centers for Disease Control and Prevention recommends diligently washing your hands with soap and water to kill germs and harmful bacteria whenever possible.

When a sink isn't an option, hand sanitizers are a good alternative — as long as the formula has an alcohol content of at least 60%, the CDC says.

Those recommendations have led to hand sanitizer shortages in retail stores and online. And as the supply goes down, prices surge. A 12-ounce Purell bottle, which retails for around $4.50, was selling for $50 a bottle on Amazon as of Thursday. (Amazon has pledged to crack down on price gouging and has suspended many sellers from overcharging.)

If the cleaning aisles of your local stores are bare and you don't want to shell out unnecessary cash, you can make hand sanitizer at home that meets CDC guidelines, according to Melissa Maker, host of the CleanMySpace YouTube channel and founder of Clean My Space, a housekeeping service based in Canada.

Her sanitizer takes about a minute to make and costs just $1.10. The key ingredients are rubbing alcohol and pure aloe vera gel. You can add in a moisturizer like almond oil to prevent your skin from drying out, and a few drops of an essential oil, like eucalyptus, to make the smell of rubbing alcohol a little less harsh, says Maker.

Here's her recipe: