...and then when you look it up that way, if you note that it is U+2F54, and if you have your your input source set to "Unicode Hex Input", you can enter ⽔ by holding down the option key (⌥) and typing 2f54.
As far as I know this only works for characters in the BMP, but for such characters it may be faster than picking them from that cmd-ctrl-space popup.
If you don't have that input source available, you can add it via the "Input Sources" tab of Keyboard preferences. There you can also enable showing the input menu in the menu bar giving you an easy way to switch between "Unicode Hex Input" and your normal input source.
As far as I know this only works for characters in the BMP, but for such characters it may be faster than picking them from that cmd-ctrl-space popup.
If you don't have that input source available, you can add it via the "Input Sources" tab of Keyboard preferences. There you can also enable showing the input menu in the menu bar giving you an easy way to switch between "Unicode Hex Input" and your normal input source.