This is the first location hunt I found, Lawson convenient store. Finding this place was easy, on my way from Shinano-Kizaki station towards the hostels area I passed the store. Remember this place well, cause this is the only place in the village that is open 24/7!
So if you are here at night and you are hungry or want to buy something, this is the place to go.

For some strange reason I remember this location in the anime Onegai Twins. Miina washed her legs here in the first episode. Fresh cold water on a hot summer day, must be nice. Too bad the days I spent at Kizaki were somewhat rainy and cold T_T

Little unrelated to the Onegai Sites Tour, but Lawson is the only place where you can buy Ghibli Museum tickets. I doubt the Lawson in that village has a Loppi for buying tickets, but I just wanted to mention the Ghibli Museum. Best place to buy the tickets would be Shibuya (Tokyo), best chances of finding English speaking staff to help you.