Laural, be very careful with the acetone, if you decide to experiment. Do it outside, with a breeze or a strong fan, and wear protective clothes and a face shield. Acetone has a high vapor pressure and, when exposed to the air, it immediately forms an explosive and invisible vapor cloud. It will boil off at a much lower temperature than HEET, so a conventional alcohol stove full of acetone will probably become a fireball. I know of two cases in which a person lost their eyebrows trying to start a barbeque with acetone.
I also completely agree with Terry and John and others who have expressed general concerns about safety. It goes without saying that anyone who decides to do any experimentation with any kind of stove, no matter the fuel, should do it outside (not in the garage), with a fire extinguisher of the appropriate kind, and protective apparel (a coat and full face shield at least).
I also think it is worth noting that the alternative fuels that I suggested(long chain alcohols like octanol) are very safe as far as stove fuels go. Others on these forums report experiments with homemade high-pressure propane and butane stoves, and Terry just described experimenting with gelled alcohol. I'm not advocating any of those. Also, these forums and others are replete with discussions about making stoves out of cat food cans, altoid tins, and beverage containers, using denatured alcohol, automotive fuel additives (HEET), isopropanol, and other flammable liquids. Heptanol and octanol have lower vapor pressures (less explosion risk) and are less toxic than the methanol we all routinely use. They have a potential to be more efficient and safer than conventional alcohol stove fuels.
So, let's be prudent and take precautions when doing our experiments, but also let's refrain from being alarmist.