I've been using a ZIP Countertop Reverse Osmosis Water Filter:
https://www.amazon.com/gp/product/B0076CQXAQ/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
Alternatively there is a slightly cheaper model available, the AquaTru Countertop Water Filter Purification System
https://www.amazon.com/gp/product/B01MDLMBKC/ref=oh_aui_detailpage_o06_s01?ie=UTF8&psc=1
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