How I’m using the Evaporation trick in my show right now is pretty simple. I take pour red liquid into a cup and when I turn the cup over a red ball falls out. Not much to it.
There is one little thing that I sometimes have to do to the liquid. Sometimes the liquid it too clear, so I have to make it a little more opaque. How I do that is simple add a few drops of non-dairy creamer to it and that makes it cloudy.
Using non-dairy creamer makes cleaning up the bottle little bit easier. Something in the dairy that makes the bottle get a little gross over time. There’s no reason why you can’t use milk, or half and half as long as you clean the bottle well after each use.