Bottle Rocket Launcher: The Cheap, Doesn't Get You Wet Edition

Whether you're a teacher, a kid, or just someone that wants to have fun with some water, bottle rockets are a good way to explore aerodynamics and basic rocketry without breaking the bank. (Plus, it's a good way to reuse old water bottles. Think green!)

Step 1 Parts and Tools

Parts:
1   - 10' length of1/2" PVC pipe (not CPVC).............$1.68  
3   - 1/2" caps.............................................................0.27
2   - 1/2" elbows..........................................................0.28
1   - 1/2" cross............................................................0.98
1   - 1/2" to 1 1/4" hose clamp....................................1.05
1   - tire valve stem...................................................~2.99
10 - 8" Zip Ties (pack of 20).......................................1.95
1   - 2L bottle...............................................................free
                                                                               $10.02
Tools:
PVC primer and cement ($7.51)
Drill or something with which to drill
Hack saw or other pipe cutter
Candles and ignition source
About 10' of string
Measuring tape
Sand paper
1/2" drill bit
Duct tape
Scissors
Marker
Pliers