Many stores catering to mountain climbers

Many stores that cater to mountain climbers and hikers usually have items useful in responding to disasters (water purifier bottles for example); the Ogawamachi area of Tokyo, near Ochanomizu/Meiji University/Nikolai-do (Holy Resurrection Orthodox Cathedral), is full of such stores, but ICI Ishii Sports [Ishii Sports outlets are found throughout Japan as well; I think it is now owner of the formerly separate IBS Ishii Sports {located in Nagoya, Osaka and Fukuoka} as well... I assume the IBS outlets also have such goods in stock] should have such items handy