There is a fairly short list of materials that are deemed safe to use with high proof alcohol liquid or vapour. Luckily PTFE is one of them. Using PTFE tape and cardboard you can easily make a DIY gasket to replace any silicone or rubber gaskets that will come in contact with high ABV alcohol. Commonly called the everlasting gasket in distilling circles, these can be used on a pot or reflux still. Or on storage containers.