Garmin eTrex super cheap screen guard

Step 2: Preparing the bottle

Empty, wash and dry the bottle, then remove the lable from the bottle.
Now poke the scissor into the bottle carefully and start cutting it so that you are left with the transparent cylindrical portion of the bottle as shown in the picture.

Since I don't yet have a good camera and the bottle is transparent anyway, I will try and explain with the help of hand drawn diagrams.