I'm getting this one because I live in an apartment and can't plumb one in. The thing is modular and I might add the alkaline filter later.

APEC Water Systems RO-CTOP Portable Countertop Reverse Osmosis Water Filter System, Installation-Free, fits Most Standard Faucet https://www.amazon.com/dp/B00IB14XDU/ref=cm_sw_r_apan_i_Y0X09WAR2JYYXWH6PF0N?_encoding=UTF8&psc=1

APEC PHPLUSKIT-14 US MADE 10" Alkaline High Purity pH+ Calcium Carbonate Inline Filter Kit with 1/4" Quick Connect https://www.amazon.com/dp/B01CUS46DG/ref=cm_sw_r_apan_i_W2XF6Q3NP088MFWR79MT?_encoding=UTF8&psc=1