Water, water everywhere but not a drop to drink? No worries.
Place the drinking glass inside the pot pointing up, as if it already had delicious clean water in it. Pour saltwater into the pot to be distilled. Just make sure no saltwater accidentally gets into the glass.
Invert the cover of the pot so that the knob of the pot is directly above the opening of the drinking glass.
Boil the water on the heat source. As the condensation accumulates on the lid of the pot, it will roll down into the glass. Voila! And you thought eighth grade chemistry class was useless...