No, not the kind of bottle rockets you used to light with a match and fire recklessly at your cousins. This rocket is made out of discarded soft-drink bottles and fuelled with pressurised water.
You may recall toy rockets from your childhood that worked on a similar principle. TV commercials aimed at kids would show an excited kid pumping up the rocket and watching it blast off into the lower stratosphere. In reality, it would barely blast off to the lower limbs of a sycamore tree. Now, however, you've got a chance to take that painfully ineffective toy from your childhood and supercharge it to actually reach rather impressive heights.
How high? While you won't be delivering any low-earth orbit payloads with your bottle rocket, it can get quite a bit further up than that old toy rocket many of us recall from childhood. Here is a bottle rocket achieving over 180m of elevation:
Check out the full tutorial at Instructables for more information how to turn your leftover bottles into giant, water-fuelled rockets.
Professional Water Rocket Guide [Instructables]