Originally Posted by Civbert

It's going to stretch them a bit.

I think maybe you could use different analogies. One analogy might only illustrate one truth about the Trinity, but would be false if applied further. You can use that fact to help show what is not true about the analogy. For instance, the water, ice, and steam analogy shows specifically that it is all one substance (H2O) but three persons (ice, stream, and water). But you need to point out that God is three at the same time, while water can not exist in all three states at once. Also point out that God the Father and the Holy Spirit do not have a body so substance in the Trinity is not physical.