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Bluelighter
Why don't you just buy capsules and take your pure dose split up across an hour or two?
Thanks for the advice, but I've already decided against that for the time being. Dosing via gelcaps would require me to evaporate the water from my solution, since wet gelcaps don't last very long

yeah, DXM tastes vile, even 60mg dissolved in a big glass of orange juice has to be so bitter
I cannot detect any bitterness at all when it's mixed into orange-pineapple juice. A larger dose would probably be another story, but even then it's only going to be bitter. Most of the bad flavors present in store-bought cough syrups are caused by other ingredients. DXM HBr itself is only bitter, like almost any other compound out there.
So I repeated the experiment yesterday: a little over 60 mg DXM mixed into 1 cup of juice, sipped all day. Same antidepressant effects. At one point I loved everyone and everything; it was just a happy, happy time. But the effects went a little too far, and some slight edginess set in. Woke up today feeling high, as usual, but I can see it being a good day already.
For maximum therapeutic benefit, I think I will have to lower the dosage back down to 40 mg.