Water purifier: Panasonic TK-CJ11-W

You can get this water filter on Amazon for less than 4000 yen. We chose this one because the cartridge lasts an entire year (a replacement cartridge costs about 4000 yen). And we were spending between 2000-3000 yen a month on bottled water, so this made sense.

The water tastes amazing and I love it. You can get all the specs here  (Japanese).