I use cosmetic containers, meant for samples for like lotion or something. You can get like 120 at a time, use the 5 gram one, not the 3 gram
Those have the spiral thing on them at the top, meant for the lid to screw on there right? Won't that look a little strange?
It depends on how you want to configure it, in my nests, it really doesn't look out of place. You can also turn it over and drill a hole, but then you have to make sure to seal the twist section with silicon or something, or else it leaks out in a day or 2.