Klean Strip Green has around 90% give or take ethanol but does burn with a yellowish flame, available from home depot, orchard supply hardware, ace hardware if pre-ordered.
I think Lowes has Sunnyside denatured, which is mostly ethanol, never seen it burn. The green one, that is, that's probably a good bet however if you can find it.
You can, like I did, order bulk e-nrg which is mostly all ethanol and designed for burning indoors in fireplaces, so it's a decent bet it's reasonably non toxic.
Someone found that in a store, minimum order is 12 bottles though, quarts. I still haven't tested that one though, I should.
[update: after testing, do not use e-nrg, it soots heavily and is useless for stoves]
You should give some thought to how toxic the fumes are for sure, during my stove testing phase I discovered that, yes, in fact, if you have your head close to the stove to watch it burn, repeatedly, you will experience the negative side effects listed for the toxins burning. Kind of nasty, but if you are out in the wilds and they are blowing away and being dispersed, it's not so bad.
I'm not certain the yellow flames matter that much, they do stain the pot a bit, but my burn times are pretty much the same, as are the quantities of fuel required, as most other people report at the top end, that's more a function of stove/heatshield/pot type/width than of the fuel though I think. I've used mostly klean strip green.
Some observed that the straight methanol like heet yellow burns better at high altitudes (> 8k feet, or so), I checked that with a real live chemist and he agreed, the chemistry/physics of that claim is correct for methanol.
The general slx is as noted above filled with extremely vile toxins, and I would, and do, avoid it. Why rei stocks that one is beyond me, when there are other much cleaner alcohols out there easily available.