I’m curious. How do you know that the do-it-yourself liquid you made was a solution not a suspension (or some other type of liquid)? Did you have it professionally analyzed?
I don't want to insist I know scientific knowledge.
Thinking about it, both milk and vodka do dissolve valium, yet, water doesn't, so, with my limited scientific knowledge, perhaps you could say it's a solution within a suspension.
Full fat homogenised milk has lots of evenly distributed fat globules, and the benzo is dissolved in these globules, but not in the whole liquid, so, that could be a solution within a suspension also.
I hope that makes sense.
I'm not insisting I right, though, as I am not a scientist.