Aska, thank you for asking. Let's get the details you need.
We recommend connecting the water line supply to use the ice maker. However, if you choose not to use the ice maker, then there is no need to install the water line.
Please refer to your user manual for more details. Turn to pages 18 to 23, "STEP 4 Connect the water line."
User Manual
https://downloadcenter.samsung.com/content/UM/202503/20250325063654532/TMF_RT6300F_DA68-04817B_EN-MES-CFR.pdf
Have a great day.
^Camille