well y’know for a good molotov you really need some kind of thickener, be it hand soap, sugar, liquid detergent, engine oil, rubber, styrofoam etc…
(styrofoam mixed with petrol is practically home-made napalm. Don’t do this at home, kids. Nearly lost my eyebrows last time.) side affects of adding a thickener is that you get a lot more smoke and the mixture is much more prone to sticking to surfaces.
Additionally if you can get something like a test tube of nitric acid and some sodium or magnesium…
Anyway, as to less than 100% proof alcohol… Personally I’d recommend something like turpentine or rubbing alcohol, both are things that can be found around the average home. I’d wager than you could also find both in supermarkets and some rubbing alcohol sold in pharmacies.