Yes his pants are on backwards. :)
What you need:
- an empty 2 liter bottle
- drill and drill bit
Carefully make holes using a drill in the top 1/3 of the bottle. I originally made the holes in the bottom of the bottom like the top right picture from Pinterest but as soon as you start filling it with water, it was obviously leaking out. To fast too. So we tried again with a new bottle. Having the holes on the top makes it so much easier! Trust me. Then just fill it up with water and put the top back on.
Time to have fun and get wet!
It's even great for when they want to help water your plants.