I'll usually just use the rub ground up fine if its not already, add brown sugar and apple juice. Stir it up so it gets dissolved and inject. I'm sure others will offer some other ways but this seams to work for me.
That's because you pretty much said it wolverines. The only thing I might add is to strain the injection solution if there are large particles remaining after grinding. Cheers!
I just did one, 32 oz. beef broth, 1/4 cup BPS Money Seasoning, five minced garlic cloves and a little bit of Pepper. Put in sauce pan and warmed while stirring to dissolve the seasoning in the broth. Then waited until it cooled to room temp and injected the heck out of that Brisket.
Add a note, I did strain through some cheesecloth prior to injecting.