I use the small plastic cups with lids. See them in the fast food joints, they come in packs of 16 for a couple bucks. Can keep paint for a day or two, but only mix maybe 1/8 oz at a time to do a complete piece. The acrylic comes in small plastic bottles with a flip-top so getting small quantities is easy. "Ceramacote", so an art or ceramic supply. Dilute 2 water, 1 paint, apply with brush and immediately wipe with damp lint-free rag. If it is too lite, repeat. Works for me on small pieces as in for a puzzle or segmentation and such.