A:Answer Hi Clowery,
Yes, the refrigerator needs to be connected to a water line for it to make ice.
Please see the "Connect the water dispenser line" section of the user's manual, page 37, 2nd paragraph, for reference.
Manual
https://downloadcenter.samsung.com/content/UM/202310/20231026145349567/FDR_RF6500C_3Door_MANUAL_WEB_DA68-04752Q-00_EN_MES_CFR.pdf
Have a great day.
^Aloe