Following an article which falsley claimed that water-cooled PC chips are something new and extremely rare the BBC added the following disclaimer:
Modifications of this kind can be dangerous and invalidate manufacturer warranties. Such projects should only be carried out by qualified engineers in controlled conditions.
In fact you can buy a DIY water-cooling kit from any competent PC supplier and fit it yourself without any engineering qualifications or risk to life and limb. It is only marginally more complicated than fitting a new heatsink to a processor chip!