In my box of assorted plumbing parts, I pulled out a garden hose spigot. This one is designed to screw onto 3/4" threaded pipe. That's close enough to the threads on a soda bottle to just screw the bottle right into the end of the spigot.
On the hose end of the spigot, I threaded on a garden hose. This one happens to be a double-ended (female/female) hose, which is similar to a clothes washer hose. The female connection on both ends lets you connect the spigot on the soda bottle to a standard outdoor garden hose faucet.
I punched three holes in the soda bottle with an awl - two facing up, and one out on an angle.
Also, by adjusting the knob on the soda bottle, you can make it go from a high-powered sprinkler, down to a low-power drinking fountain!
See more fun, recycled DIY projects at EcoProjecteer.net!
I later made another version of this sprinkler, which uses ONLY a water bottle as the sprinkler material. Click here to see the MK2 Soda Bottle Sprinkler.