You can get denatured alcohol at any hardware store that sells paint. It will be called "denatured alcohol," "denatured ethanol," or "denatured ethyl alcohol." It does not need to be 100% alcohol; it can be 70% or more. Also, isopropyl alcohol, which is only 5% alcohol, is not the same and should not be used.
A homeschool resource that sells this product is: Home Training Tools.
Try: https://www.homesciencetools.com/product/denatured-alcohol-fuel-16-ounces/Tags: Chemistry, Experiments, General