Wait until the weather is at freezing temperature of 32 degrees Fahrenheit.
Attach a sprinkler to the end of your water hose.
Aim the sprinkler toward the object that you wish to form icicles on, such as the eave of a roof or a tree.
Turn on the hose, but not too much. Too much water will just run down and freeze on the ground. A slow, steady mist is best for forming icicles.
Wait until icicles are formed. This will take several hours, so be patient. Turn off the hose when you are pleased with your icicles.