So I have like some glowstone in my potions lab.
Do i have to put that in my collective and go all the way back to my building every time i build, or what?!
If the chest in your potion lab is publicly accessible to UBSR members, you can keep the glowstone in there.
Storing glowstone outside collective storages without it being public isn't allowed. If you need glowstone for potions often I'd recommend building a potion lab next to the collective storage. Or making the chest public if it isn't.