the pipe ones are really easy to make, 4 to 6 inch pipe is the best size, i only had 3 inch pipe laying around so thats what i used. cut the bottom at a 45 deg angle so you can poke it in the ground a bit but still leaves a hole at the bottom, tie to a tree ad fill, i used coffee cans, the plastic foldgers ones helps to refill each time, here is a pic of one of them