I doubt someone would counterfeit powder, as there isn't as much profit to be made, plus it's less popular. Measuring doses: get a scale to at least .1g accuracy. Your best bet for processing it is to get ethanol (everclear, grain alcohol, etc.) and dissolve the powder. You can get 50mg/ml very easily. Bottle in the same or similar bottles that those research chem companies use.
Anything would work, but if it isn't sealed the alcohol will evaporate. You can also use an oral suspension vehicle like OraPlus, but it helps to have a mortar and pestle with this stuff. Or, get a capping machine and some caps. Mix the dbol powder with something like baking soda or corn starch in the proper ratio to get the desired mg/cap, though I'm not about to try to type out how to do that.
You should be able to find it online fairly easily. I would advise against measuring out each dose, as each dose will have some variability to it, unless you get a really accurate scale, which would cost quite a bit of money.