Step 2: step 2
Now that you have the bottles you need to take one and flip it upside down.
Then using a knife or scissors, I used a knife which turned out to be easier to use, start cutting from the middle and work you way down towards the cap.
Stop just above the cap, repeat the step above, creating strips of plastic that come from near the cap.
Finally all you do is bend in the plastic strips until they curl.