This is a pretty quick and simple instructable, so let's dive right into it.
You will need:
-A glass bottle with a screw on top, such as IBC rootbeer.
-A plastic 2L soda bottle
-A knife and/or a sharp pair of scissors (If you are a young Do-It-Yourselfer, ask a parent or someone else who is responsible with sharp objects to do the cutting for you)
Optional: Aluminum Foil
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-Knives and scissors are sharp! Do not cut toward self. Do not lick blades. Do not ingest plastic trimmings.
-Hot beverages are hot. Wait till it is not scalding before drinking it. Do not spill hot drinks on your legs/arms/torso/crotch/etc.
-Use common sense! If some part of the back of your brain is saying "That's a bad idea," it probably is! Don't do it!
Step 1: Wash the glass bottle
Wash out the glass bottle with hot soapy water.
Step 2: Off with its head!
You want a hole big enough for the neck of the glass bottle to just fit through.
Step 3: Short Division
You want the bottom half slightly bigger than the top half.