OK, you're out somewhere and you want to refill your empty water bottle. You step into a public restroom(where else can you find water?), only to find the sink too shallow to fit the bottle under the faucet. This is a common problem.
There should be an attachment that is a short accordion-style compressible plastic tube(like the tube with a vaccum cleaner but of course much shorter and more solid). The far end of this little bendable tube(with the mouthpiece removed, of course) fits under the faucet and allows water to flow into the bottle. You can screw the attatchment into the top of the bottle where the mouthpiece goes. And you can screw the mouthpiece into the top of this attatchment. I believe this should be pretty cheap and easy to fabricate.
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I've seen something like this. It is marketed as a toy because of the noises it makes as you extend/compress it but now that I think about it, it would work fine for what you suggest. With a screw-on bottle attachment at one end and a rubber o-ring on the other it would work wonderfully and would likely cost under $2.
Great idea. With a bit of extra thought, this could perhaps be designed to work in reverse - so having drunk the water, it could be, er, refilled by the user if there is no other suitable place to pee - the attachment nozzle could be useful for women like a product already on the market.Just don't accidently drink it again the second time !
A cup that fits to the base of the bottle would permit easy refill of the bottle from not only a faucet but a pail of water or some other transient container.