Water Bottle Rocket
First you take a 2 liter pop bottle, then you take a cork (Value Home center) and put a basketball pin right through the middle of the cork. make sure the cork is big enough so that not a drop of water can leak out. Next you connect the pin to the airpump, and fillthe bottle 2/3 with water and stick the cork allthe way until it reaches the bottom of the neck of the bottle. you can add fins to stand it up or have someone who is willing to get wet hold it. Turn the bottle upside down and begin to pump and after 10 or more pumps the bottle should launch. Try different size bottles with different corks. ( the smaller bottles go higher){{{
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By: Karim
Do you have a corner in your backyard that needs a bit of sprucing up? Perhaps this might be the project for you, Rather than spend your allowance on a packaged waterfall from Home Depot that will run you in the $200-$300 mark if you buy it in the middle of summer, you might opt for something a little more unique that will cost yes less than half of the retail price. Some of the materials we used include railway ties to build a short wall, landscape ties to close off the waterfall area, one inch river rock, pea gravel, plastic sheeting, a water pump, a few 5 gallon pails and assorted rocks from a local landscaping firm. Have a gander at what we did and if you have suggestions or make one yourself, please send me a copy.
I came up with this when I was house sitting for my parents and the basement started to flood. The original was made with a 5 gallon bucket. I have made two since and found that culligan style water jugs work better. I don’t have one currently constructed, I am bored at work and piece this together with MS Paint. hehehe. But you should get the basic idea. This is my first Instructable, I’ve been reading instructables everyday, and I’ve been dying to post something. Hope this helps some of you out.
A very easy to build still made with material you probably already have at home
Decorate your room with this beautiful plastic bottle that looks like a colourful crystal.
Ok, I realise my previous febreeze mixture wasnt so good but this one, will smell even more fresh and wont give you headaches!
My pet fountain finally died and I didn’t want to pay at least $30 for a new one, so I figured out how to do it myself. 
Looking for a new way to spook your trick or treaters? Maybe you have a haunted house that needs some added effects. Whatever your reason is, this is one way to creep people out.
Alright, i have not tried this yet, and it is compleatly hypothetical at this point. Ive learned, over the many years in school, that if your going to mix an acid and Water, you gotta pour the acid into the water, but if you pour the water into the Acid, you get a huge explosion.