For water filtration, I installed a Doulton 2 stage water filter. One filter is scale and the other one is ceramic/carbon. It does an excellent job of getting us bottled water grade product at the tap. The only down side of it is the slow pace that it fills. With the 2 pretty legit filters it takes a bit to fill a coffee pot. I installed a little pressure tank downstream of the filter and this gives me a fast fill for a glass of water. I would like to install a larger pressure tank so I could get enough water at a fast flow rate to fill a coffee pot or kettle. But that size tank will take up valuable space........
Coffee..........Kalita drip for me. Flair espresso maker along with a steamer on the stove to make cappuccinos for my bride. Works great. Whole bean only and we grind with a hand grinder just before each use. And for kicks I keep a pre-1964 Revereware stove top percolator when I want to go old school