I can tell you when we were just drinking & cooking w/water from our 5g bottles 2 of us went through 6g in 7 days. Get rid of juice, milk, and soda and that number probably climbs to 8-10g a week for 2 people. That is for drinking and cooking only. (That's all we store for, we live close enough to refill / get cleaning water or go clean-up.)