Ide Sake Brewery (Kaiun)

The Ide Sake Brewery, maker of the Kaiun label, is one of the oldest businesses around Lake Kawaguchi and a wonderful place to connect the region's famous water to something you can taste. The Ide family has been brewing in the Funatsu district for generations — the family's roots in the area stretch back centuries, and they have produced sake here for around two hundred years — using the soft, mineral-clean snowmelt that flows down from Mt. Fuji as the foundation of their brews. That water is the reason so many drinks producers cluster around the mountain, and nowhere is the link clearer than in a glass of local junmai sake.

The brewery welcomes visitors to its historic premises, an atmospheric old wooden building along the town's traditional street. A guided tour — best reserved in advance — takes you through the brewing rooms and explains the sake-making process step by step, from polishing the rice to fermentation with koji mould and the slow, cold winter brewing that produces the cleanest flavours. The tour usually ends with a tasting of several of the brewery's sakes, letting you compare dry and fragrant styles and understand how the pure water shapes their delicate character. Even for those who arrive knowing little about sake, it is an accessible, hands-on introduction to one of Japan's defining crafts.

What makes Ide special is authenticity and continuity. This is a genuine working family brewery with deep local history, not a tourist attraction dressed up as one, and meeting the people who make the sake — and seeing the traditional equipment still in use each winter — gives the visit real substance. The Kaiun name, meaning roughly 'good fortune,' is well regarded, and buying a bottle here, straight from the source, makes for a far more meaningful souvenir than anything from a shop.

Historically, the brewery is part of the fabric of old Funatsu, the lakeside town that grew up as a stop on the pilgrim and trade routes at Fuji's northern foot. Its longevity is a reminder that this resort area has a working heritage well beyond modern tourism.

The visiting experience is calm and personal, on a small scale that suits the intimacy of a family business. The shop is open through the day for browsing and purchases, while tours and formal tastings run by reservation, so it pays to arrange ahead, especially in busy seasons. Winter, the traditional brewing period, is an especially evocative time to come.

Getting there is simple: it is a short walk or taxi from Kawaguchiko Station through the Funatsu district, close to the other lakeside sights. For travellers curious about how Mt. Fuji's celebrated water becomes sake — and keen to taste the result at its source — the Ide brewery is a quietly rewarding and authentic highlight.