I would like to use a small marble to push out liquid from a packet of some sort drop by drop. I don't know where to get started on this...All I know is that I need to somehow release a few drops of liquid from something small every few seconds. I was thinking of having a small plastic packet that has some sort of rubber o-ring thing that limits the flow of liquid to very little and a small marble's momentum forces the liquid out every few seconds. Basically the packet and marble are placed in a tube and the tube is pulled/dragged so the momentum/inertia of the marble on the packet pushes out the liquid.
In the below diagram the brown circle is a packet of liquid, red thing is some sort of rubber o-ring, the orange circle is a marble...When the hollow tube is pulled to the right, the orange marble slides to the left and presses on the packet...I don't know what these materials are called o or what other method I can use to accomplish this so all help is awesome!