You can not really have 100% alcohol. It’s really hard to get the last few percent of water out of it. Destillation is useless at that percentage and drying agents are used, but even they can’t get all water out. Denatured just means that there is a bitter tasting chemical mixed in so it won’t be drunken by those wanting to avoid alcohol taxes.
If you like Lemmy, you should really try out Kbin. Its mostly the same but better. You can still sub all your lemmy communities but with a much more modern interface.