Determine the size and type of the gooseneck you need. Consider the weight and size of your water purifier and choose a gooseneck that can support it.
Purchase the gooseneck and any necessary mounting hardware.
Attach the gooseneck to the water purifier. Depending on the design of the purifier and the gooseneck, this may involve screwing the gooseneck into the base of the purifier, using a clamp or bracket to hold the gooseneck in place, or some other method.
Adjust the gooseneck to the desired angle and position. A flexible gooseneck should be easy to adjust and hold its position without sagging or drooping.
Test the purifier to make sure it is still working properly with the new gooseneck attached.
Remember to follow any manufacturer's instructions for installing and using the water purifier and gooseneck, and to regularly clean and maintain your water purifier for optimal performance.
