Water & Sand
Warm some water in a pan and pour about half of it in a regular cup. Now with the help of a tea spoon, add a spoonful of sand into the warm water and note what you observe.
Salt & Water
Take another cup of the same size (as the previous one) and fill it with the remaining warm. Same as in the previous step, add a table spoon of salt into warm water and again note the observations.
Filtration of Sand & Water
Put a funnel into a beaker and fix paper over the funnel. Pour in all the sand and water mixture slowly. You will see that water distills inside the beaker and the sand is left at the surface of the filter paper.
Filtration of Salt & Water
Now try the same with salt water. If you taste salt water before and after filtering it, you will have the same taste suggesting that it cannot be separated by filtration.
Evaporation to dryness
Pour the salt solution in a china dish and place it on a Bunsen burner. Allow the water to evaporate and observe what happens. It will be noticed that the water evaporates and salt is left behind.