To make a tornado in a bottle, fill one 2L bottle with water and glitter and tape it upside down to an empty bottle. Spin the taped bottles in a circular motion to create a vortex in the top bottle, mimicking how real tornadoes form through opposing wind currents and rising hot air meeting descending cold air. Tornadoes can span up to 10km wide and spin 100-500kph, lasting 10-25 minutes as they touch down and destroy buildings and vehicles with increasing rotational speed.