All you will need are 5 plastic drink bottles, we're using the Buxton bottles because they curve in the middle and fit together really well when cut, but you should be okay with straighter bottles too.
You will also need to hang on to one of the plastic bottle lids; and a sharp pointed knife or a pair of scissors to cut the bottles.
The reason I added a filter is because one a bee managed to fly down the pipe and got lodged in there. Fortunately I was there to release it with no harm done, but it made me think of a way to prevent anything bigger than rainwater from passing through. Not only to save the wildlife from drowning in a barrel of certain death, but also to keep the water clearer and free from debris off the shed roof.
Step 1: What you need...
1 plastic bottle lid to fit
1 sharp pointed knife
Step 2: Cutting the bottles and making the filter lid
Carefully cut the bottoms off of FOUR of the bottles at the lowest line, retaining as much of the bottle as possible.
For the FIFTH bottle, you need to cut it in half, as shown. Cutting the bottles should be straightforward if you follow the line or groove.
Next, you need to - very carefully - make several holes in the lid. It is easier if you hold it against a hard surface, like a concrete pathway! Screw the lid-with-holes onto the half-sized piece of bottle you cut previously.