Im gonna make one with an old pepsi bottle. Heres an idea where to get the copepr wire for it.
I do use copper wire. I use the 8 gauge solid core uninsulated wire from Home Depot. It is easy enough to bend but still sturdy enough to hold its shape under some weight. If you need sturdier wire go with the 6 gauge wire. You may have to experiment with the size bottle and the amount of nectar that you will be filling it with to see which one works best for you.
Got that info in humminbird feeder forum.
Where did you get your stoppers btw? thanks Tura

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Here is a link that might be useful: Homemade Feeder - Hummingbird Garden Forum - GardenWeb