Palette
One of the best pick ups I made was a deviled egg Tupperware that I use as a palette. I squirt lots of colors and grab bits of them to mix colors on my flat palette when I paint. When I need to step away, I squirt a little water on top of the paint, put the lid on, and they stay wet for up to a couple DAYS! Makes acrylic painting all the better. Tricks of the trade...