I find that 99% of the time I need minute amounts of Epoxy at any one time. Seeing that Epoxy is not as easy to cleanup as PVA glue I came up with the idea to mix these smatterings of adhesive in  soft drink bottle caps. In the pictures below you can see how I collect some in an empty water bottle for this purpose.

In the example below I used a beer bottle cap. I throw the caps away after use, which eliminates the needs to clean up.