My favorite route to camp coffee is running this GSI filter backwards: https://gsioutdoors.com/products/h2jo-filter https://gsioutdoors.com/products/h2jo-filte

My favorite route to camp coffee is running this GSI filter backwards: https://gsioutdoors.com/products/h2jo-filter https://gsioutdoors.com/products/h2jo-filter Put a week's worth of grounds in the bottle, screw on the filter, pour in some cold water, steep for 24h, and transfer to another bottle. If somebody wants "drip" strength they can cut it with water, hot or cold.