See here for intro into using glycerine to dehydrate yeast before freezing:
https://www.homebrewtalk.com/forum/threads/guide-to-making-a-frozen-yeast-bank.35891/ (https://www.homebrewtalk.com/forum/threads/guide-to-making-a-frozen-yeast-bank.35891/)
You don't use glycol!
You buy FG glycerine in the chemist or posh baking section.