I have several friends who have water cooled fridges and freezers, where they use the fresh water to cool with and they have been very please with that solution. They claim they are very energy efficient. My front opening fridge are working most of the time especially when warm below, and the fan making a lot of noise
My combine fridge/freezer gave up this fall so need a new anyhow. one pump can manage two compressors so automatically one spare if installing two units, the pump are not very expensive either.