It’s rare for me to use things for their intended purpose. By nature, I look at things with unorthodox views.
A Little Dab Will Do
Why not use what’s dried in the watercolor tube? It may not be much but in today’s economy, artist’s paints are too precious to waste. I simply cut the bottom out of the tube, and hot glue the tube upside down on top of a lid discarded from old meds or jars. Then I mix a few drops of Gum Arabic and water to the paint in the tube.
After attaching a few tubes to the lid, I set the tubes inside glass containers with a screw top lid. Mine came from the Container Store, like so many things I use.