I wouldn’t worry about it. Its only poisonous in large quantities, and if you freeze precipitated the DMT, I’m sure there’s none in it.
The amount of denatonium benzoate used is normally 30 parts per million. One gallon (3785 ml) of solvent will normally have about 113 mg. That’s the industry standard.
Denatonium benzoate is known to be soluble in water, alcohol, t-butyl alcohol, methanol, ethylene glycol and propylene glycol. It’s slightly soluble in acetone and practically insoluble ether.