The rules for denatured alcohol in the USA are contained in Title 27 Code of Federal Regulations Part 21 (e.g., 27 CFR 21):
https://www.gpo.gov/fdsys/granule/CFR-2012-title27-vol1/CFR-2012-title27-vol1-part21There are a number of differing formulas. The one thing they all have in common is that you REALLY don't want to be drinking that stuff. Furthermore, you probably don't really want to even have it on your skin, since some of the contaminants can go through skin like it wasn't there. Don't do that.
As for Acetone, remember that most of us will be dealing with "Technical Grade" materials, as opposed to laboratory grade or USP grade materials. The difference is that technical grade materials are usually about 95-99 percent pure, while laboratory grade or USP grade are significantly more pure. The problem is that remaining 1-5 percent in the technical grade may consist of some pretty toxic/carcinogenic materials. Some manufacturers specify what these contaminants are, while others just list the minimum purity of the desired material. Read the label!
As for flammability, there are a variety of factors which can affect this, such as the ambient temperature. Acetone is usually fairly pure (>95 percent for technical grade), but gasoline contains a whole slew of various straight, branched, and ring hydrocarbons, and predicting the vapour pressure of it is almost impossible, other than by empirically on a case by case basis.
As a general rule, one wants to stay away from materials containing a Carbon-Chlorine bond (well, ok, so there are a few exceptions, such as solid PVC, etc.). It's probably not a bad idea to stay away from Cyanide compounds, either (I used to have a really great Tin plating solution recipe, which was based on Sodium Cyanide. But, knock over a bottle of acid into that plating bath, and if you get one whiff of the gas produced, you'll be dead before you can even hit the floor!). There are certain other materials which can come out of solution and crystallize into solids which are notoriously explosive. Silver Nitrate is one of these materials, while other Peroxide based materials are also notorious for this.
There are probably a bunch of other chemical safety rules that I could/should list, but the basic rules are: Don't get it on you; Don't eat it; Don't drink it; and Don't inhale it.
Dave