All you need is regular 91% alcohol, glycerin, and water”
Most alcohol isn't 91%, 70% and even 50% is more common. Have a look on line. Essential oil is often used in home made hand sanitizers because MANY are anti microbial as well. In addition to taming the smell when using 91/99 percent alcohol.
https://www.bustle.com/p/the-6-best-antibacterial-essential-oils-18783842
91% is very common. Pure isopropyl alcohol will absorb water from the air until it reaches 91% dilution. Thus 91% is sort of the “natural state” of alcohol — shelf stable with no special packaging. That’s why it’s easily found in the pharmacy section at Walmart. 70% is actually the better disinfectant and is made by diluting with additional water. To make hand sanitizer solution you start with 91% since you’ll be diluting it down to the 70% range with glycerin and water. Glycerin is what gives it the thick consistency so it sticks to your hands rather than just dripping onto the floor. The essential oils are optional.