You need UV for sure for the bacteria kill, it's always good to oversize the UV some to ensure enough "contact" time with the water, they are all based on flow rate. To improve the taste you could try a GAC (granulate active carbon) at the POU (point of use) or a Carbon Block for the whole cottage. I would use a large 10-20 micron pleated filter on the pump line into the cottage that is rated for the pump flow to keep the large particles out of the system and follow up with a smaller filter after your surge tank, the carbon block filter could be this one. The most important thing with any system is the maintenance, be sure to change the filters when needed and you may want to consider a UV with a meter that tells you the "intensity" of the system.
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