before you leave the house, make sure that you have an ice tray filled with water in the freezer so that you have a full complement of ice cubes the next morning. this will come in handy the next day as you will see in the next step.
cold water. now, you will need some water. you will need cold water. to be more precise, the colder the water, the better. remember the ice tray you filled up the night before? fill a glass with as much ice as you can and pour in your water. it will be best if your water starts off cold so if you can keep 