Directions First draw out on the paper the layout of your water park. You can include pools, slides and maybe even a fountain. Be sure to have a specific starting point, usually higher than the rest. This will be your blueprint.
Figure how many cups, straws, and recyclables you will need to build your project. Also grab about ½ a stick of modeling clay. These items will be your building materials.
You will need a large area, preferably outside, weather permitting. Otherwise you will want to be in an area you do not mind getting wet. You can call this area your construction site.
Layout your cups, straws, and recyclables to match what you drew on your blueprint. Lay everything out before you try putting it all together. You may find you need something to set under some of your cups to gain height. You can turn a cup upside down and use it as a platform. Or use it right side up for a pool.
Once you have everything set in place you can proceed with the final construction phase of your project. Using a pencil, poke a hole near the base of each cup or bottle where needed. Be sure not to make the holes too big. They only need to be big enough for the straw to fit snuggly in.
Insert the straws one at a time into the cups and bottles, placing duct tape or modeling clay around the holes to prevent leaks. To join the straws together, cut slits in the end of one of the straws, and insert another straw inside this end. Wrap duct tape around these seams if necessary to keep the pipes from leaking. Foil can be used to make funnels or open water channels.
Once you are sure everything is connected and joints are sealed you can prepare your water. It does not take much water to get these projects to work depending on their size. A small pitcher should do nicely.
To spice up your project you can add food coloring to the water. This makes it easier to see the water move through the straws. Start pouring the water into your starting cup and watch it flow.