Place a soup spoon in a freezer for 30 minutes. While waiting, bring a tea kettle filled with water to a rolling boil on a burner.
Remove the spoon from the freezer and insert it into the line of steam rising from the tea kettle's spout.
Place a glass directly under the point of contact between the steam and the spoon. Condensation causes the hot vapor to cool instantly when it comes in contact with the frozen spoon. This results in the formation of water droplets, which should accumulate and drip off the spoon.
Present the accumulated water in the glass to science fair judges and observers.
Remove the eraser and metal end cap from two pencils. Sharpen both ends of each pencil.
Find a small butter tub lid and glass that fit together to create a tight seal around the mouth of the glass. Insert the pencils though the tub lid 1 inch from each other.
Dissolve 1 teaspoon of salt in warm water and let sit while connecting the pencil tips to the battery terminals with 18-inch sections of electrical wire.
Pour enough saltwater into the drinking glass to fill about 1 inch up. Place the butter tub lid on the glass so that the ends of the pencils that are not attached to the battery are immersed in the saltwater. The water should begin to decrease as electrolysis separates the hydrogen atoms from the mix.
Connect a thin hose to a hydrogen tank. Both can be found at many home improvement stores. Remove one pencil from the lid and detach from the battery. Insert the hydrogen tank hose. Turn the hydrogen tank valve to inject hydrogen into the glass and create water.