Rubbing alcohol is a form of fast evaporating wood (if I remember corectly), alcohol that it's evaporation rate depends on the percentage of water that comes with it. The more water in it the slower it evaporates, 50% to 95 % alcohol the rest water. This type is commonly used for sterilizing/cleaning instruments and on the skin (topical, it's called, I think) for instance, like injections. It's also recommended to be applied on non broken skin because it stings

like no tomorrow if applied on an open wound.

It also used to relive inching from insect bites, poison ivy, ect and it can be used to cool the body down. I my self use to thin out epoxy glue when needed. Oh yeah one more thing, it's made so you can't drink it. :drinking:
You should be able to get it from your local grocery, and/or drug store. If you want to get a large amount like a gallon jug, talk to a pharmacist.
I found that using water for shoes that require a lot of stretching works the best. Just soak the shoe/boot in hot tap water for a few minutes. Stretch them, and let them air dry. This can take as much as 48 hours to completely dry if you intend to wear them. You don't have to let them dry completely if you still need to stretch them again.
However, rubbing alcohol works, but in my opinion it is most effective in light to mild stretching. It takes a lot of rubbing alcohol for heavy stretching and at that point I see it as not worth the money.