Preparing tinctures and powders

Following Buhner's protocol, I would like to know if I can prepare dosages of several tincture extracts early in the morning by placing them in one mason jar (cover screwed on tight) for use with later in the day. And also if I can combined powder extracts in the same jar. Not sure if there's some degradation that will occur if the tinctures dry out by getting absorbed by the powder but I would like to avoid this if that's a problem. If I can't combined all tinctures and powders into one mason jar could I then just have two mason jars - one for tinctures and one for powders?

Trying to avoid carrying around a million bottles and powders with me.

Thanks