I've found great containers to use for things like wet water, dilluted or full strength glue, or paint. Used, cleaned tomato sauce or mushroom cans hold four ounces of liquid and are great to use for construction. I've also used the plastic cups that individual fruit comes in like might be packed for a lunch. When ypu are finished using or one gets too grody for continued use, either throw it away or put it in recycling, depending on wnhat your recycling rules are.
Gene
Although not the best for paint, the baby food plastic containers with a snap on lid are perfect for parts and dry goods. If you have a baby, save these. Or if you have no teeth, you might also have some of these, LOL