These folks are an ebay seller, CoopsNMore.com there are 4 pages here of waters, nipples, cups, buckets, kits, etc. They are NOT difficult to install as someone said before. You simply drill the correct size hole, tap out the threads and screw in the nipple. I like to use a tap to cut the threads in buckets and pvc pipe. I wouldn't even mess with making one in a 16 or 20 ounce soda bottle because in a couple weeks your going to have to be filling it twice a day. If you go ahead and go to the hardware store and get a 21/64 drill bit and a 1/8-27 tap you will be able to make all the waters you will ever need in your lifetime for 10 or 12 dollars. If you plan on just trying to screw the nipples in plastic you will need to get an 11/32 drill bit, that's 1/64 larger, so you can maybe screw the nipple in a plastic bucket and worry about it leaking. If you do this put some silicone sealer on the threads and don't try to use it for at least a day while the silicone dries.
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