Question:
In some computers, CPUs are cooled via Water (Forced Convection)
You need to make a study on how this kind of systems work, you will find everything you need to get started.
Used CPU : https://ark.intel.com/fr/products/97129/Intel-Core-i7-7700K-Processor-8M-Cache-up-to-4_50-GHz
Cooler(incl. tubing etc..) : https://hexus.net/tech/reviews/cooling/48789-cooler-master-eisberg-prestige-120l/
For the temperatures of cpu i''ll let you choose