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I’ve not done it on a plastic bottle but have a few metal can caps fitted with a brass tube that work well. You can likely come up with something similar
A lot of folks use an old centerfire case. Drill a hole through an extra bottle cap to fit a rimed case, like maybe a 30-30. Open up the primer hole in case and epoxy the case to the cap. You will want to find a stopper for your new spout. Something like a foam ear plug could work. I’ve have also seen the business end of a toothpaste tube or similar cut off and epoxied to a cap.