How to build a water rocket launcher

How to build a water rocket launcher without using sprinkler pipe cement. Here is a supply list: Two 1/2 inch (`15 mm) threaded pvc pipes 24 inches (about 60 cm) long (I used the dark gray pipe-schedule 80) 1 threaded 1/2 inch (15 mm) 90 degree elbow 1 threaded 1/2 inch (15mm) end cap pipe thread tape pack of cable ties (zip ties)–you’ll need 8, I used the 8 inch (about 20 cm) ones duck tape adjustable clamp conduit clamp tire valve stem (from walmart or autoparts store) string scrap board(s) I don't think Amazon is a great place to get supplies like this but I made a wish list to give others a better visual of what you are looking for at the hardware store. Find it here: http://amzn.com/w/29FGPQVV5UOYA