Well the easiest way to use the ox powder would be to put it in 151 or grain would be even better. I'm currently doing this with my anadrol and winny. 5g's of powder in 100ml's of solution will equal 50mgs/ml doses. Make sure you shake before drawing because it will be in a suspension. By the way I stole this idea from some one on this board that posted it awhile back, I'd give credit but don't remember who it was.
You could also use proplyene glycol, easily available online. Grain is not legal where I live, and I heard that ox will not stay stable in 151 very long, as opposed to the PG which will be good for about two years.