A refrigeration chiller that can chill a large tank (PVC would be least expensive unless you can pick up something used) is the typical solution if you have time to chill process water overnight. You can get to 32F with some chillers with water (a coil in tank designed evaporator). You can continue to run the chiller while the tank water is used by the process the next day- you will lose ground on the tank temp, but if you size it right, it won't get to the 68F water or whatever temp you cannot properly function.
This is typical of the way bakeries have batch cooled water for large mixers, chiling the city water between batches of dough mixing.
You''ll need pumps as well, one for circulating the water to and from the chiller and the second for the process. Pressure reducing valve for the city water inlet to the process reservoir. The tank should be insulated so you don't lose ground on temp.
I've heard of old bulk milk tanks being used for this and many other purposes, not as efficient, but less expensive if you can pick one up cheap. just get the refrigerant compressor to match, but BEWARE, most of the old tanks used R-12 refrigerant and compressors mineral based oil, so you have oil inside the tank coils and it would be near impossible to flush out to use present day non-mineral oil type compressors- the result will be a burned out compressor motor. The same holds true for R-502. The compressor manufacturer usually will not honor warranty if they find the oils are mixed. Have a good refrigerantion mechanic in the family!