I do what I've seen drug dealers do in B-rated movies and break open the capsule, then split the powder in two or four batches depending on how small a dose I want.

In the movie the bad guys put the powder into little squares of paper and folder the paper up so none splills. That's what I did, and then I store them until next time when I simply poured the powder into a glass of water for my next dose.

Make sense?