If you distribute your gum according to Nebraska law, everyone would have received one piece and it is up to each person as to what they do with their piece of gum. The only thing that they could not do is throw the gum away, because that would be wasting it or not using it beneficially. The second site is represented by Texas. To demonstrate how Texas distributes their water, have each of the students look under their chair. The two people in each group who are sitting on the chairs that have the pieces of gum taped to the bottom own the gum.
Texas policy states that the person that owns the land above the water, owns the water.
The last site represents Kansas. Kansas has some groundwater, but there is not enough for everyone to have what they want. The easiest way to explain how Kansas distributes water is by demonstration. Choose one group from the back of the room to line up. Give the first two students in line one piece of gum.