You can't make a waterer of that sort in the same way you make a feeder. It has to operate on the vacuum principle. The only way to make a vacuum waterer is to cut a small hole *just* below the lip of a bucket, fill the bucket with water, top it with a pan about 1 1/2 - 2" deep and about 2-3" wider than your bucket, then hold the pan on while you swiftly invert the bucket. The disadvantage of this over a commercial vacuum waterer is that if it gets bumped when it is anything other than totally full, it is likely to fall apart and glork your water out all over the floor leaving you with a muddy coop and thirsty chickens.
(Other waterer types exist, basically variations of tiny auto-waterers, but I don't think you can make any of *them* using plastic guttering, either, sorry)
Good luck,
Pat