How To: Make a bong out of any plastic bottle

Looking for something to smoke out of but have nothing around the house? Have a look at this tutorial and learn how to make a working bong out of any plastic bottle (Coke bottle, water bottle, etc)
This type of bong is useful if you are looking for something to smoke with that will not get you in trouble if someone finds you, also if you are traveling this can come in handy. Bongs use much less tobacco or weed than joints too, so they are great for saving money too.
This tutorial will show you step by step how to make a powerful bong using nothing but a water bottle and an old highlighter pen.