I usually disolved it in a 50:50 mixture of vodka and water. Dissolves _fine_ in that.
And as long as you're only taking 1ml of the solution at a time, it doesn't matter that there's some alcohol in it.
As long as there is no visible solids present in the liquid, and as long as the stuff was mixed to begin with (if you dissolve it in the liquid, but never shake it ever, you could end up with the liquid on the bottom being more concentrated, because it was never mixed - but once you shake it, it won't separate out. This is the reason that liquid measurement works. If it didn't, lots of things in the world wouldn't work like they do.
And phenazepam works great for anxiety. If you're on 5mg diazepam, do 0.5mg or less phenazepam to start. I find phenaz to be more selective for anxiolysis (and unfortunately, also amensia, though that takes higher doses than 0.5mg to become a problem) than diazepam. Also, while diazepam feels like it wears off faster than it's quoted halflife suggests, that's not the case with phenazepam. You might find that you need less on the second and subsequent day. That stuff lasts a longass time.