paints don't do well outside of the tubes. i had some in a 5g sample jar and the consistency changed. it didn't completely dry up, but it was harder to work with.
i always travel with sample jars of studio moisture cream and it's always been fine, and stayed moist.
studio fix powder and studio fix fluid. i'm not entirely sure how you'd transfer these, and it'd seem like you'd lose a LOT of product.
best bet is the brush cleaner. i always dilute my brush cleaner with, and put it into a spray bottle, available at any craft store, and some beauty supply stores as well. also, unless its hard for you to get to mac locations, why not just wait to B2M everything until you actually finish your products?