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If the bottle is dirty on the inside, fill it with water, close the cap, and shake it, then pour the water out. Do this a few times until the bottle is clean inside. When you are done, peel off the label and remove any glue residue. Use a permanent marker to draw a square on the side of the bottle, just below where it starts to curve upward into a dome shape. You can also mask off the patch with masking tape. The square should be no longer than your finger. Space the holes as evenly as you can. You will need to make five rows of five holes each for a total of 25 holes. If the plastic is very thick, you can heat up the nail over a flame for about 10 seconds; hold the nail with a pair of pliers so that you don't burn yourself. Wiggle the nail to remove it from the bottle. Rotate the bottle so that the holes are facing away from you. Draw a 1-inch (2.54-centimeter) U-shape on the side of the bottle. Have the top of the U touch the bottom of the bottle's dome. Cut the U shape out with a razor blade. Your watering can is more or less finished, but you can make it look more interesting by decorating it. Draw some gardening-themed designs on it using permanent markers. You can also stick on some stickers instead, but be aware that they may fall off if they get too wet. Fill the bottle until the water level reaches to 1 inch (1.27 to 2.54 centimeters) below the bottom row of holes. If you want to, you can even add some water-soluble fertilizer to the water. Hold the bottle by the sides, then tilt it on its side. Keep the watering holes on the bottom and the pouring hole on the top. When you are done watering, tilt the bottle back upright. Refill the container as necessary.

Summary:
Find a plastic bottle to use and remove the label. Figure out the placement for the holes on the side of the bottle. Use a nail or thumbtack to punch holes in the square. Cut a pouring hole on the opposite side of the bottle. Add designs, if desired. Close the bottle tightly and fill it through the U-shaped hole. Tilt the bottle over your plants to water them.