Dear Edward,
If you only want to water cooling the DDR5,
You can use below water cooling kit which includes the water tank, pump, radiator, and fans. You can use distilled water or our coolant BPTA-CMCD500.
https://shop.bitspower.com/index.php?route=product/product&path=61_143&product_id=5286
https://shop.bitspower.com/index.php?route=product/product&product_id=7443&search=500m