Stockpiling or storing supplies for future use, especially reserves of food and essentials for emergencies (noun; can be used with 'suru' as a verb).
自治体は冬に備えて燃料の備蓄を増やした。
The municipality increased its fuel stockpile in preparation for winter.
家族で三日分の飲料水を備蓄している。
Our family keeps three days' worth of drinking water in reserve.
政府は災害に備え、食料の備蓄を呼びかけている。
The government is urging people to stockpile food in preparation for disasters.