I saw a link to this article recently about a family of three who get by on $19K in expenditures:
How One Family Paid Off $118,000 in Debt - US News
"Her family still lives on about $19,000 a year, so they can save the rest. She even built her own furniture when her family moved into a new house, and asked family members for power tools as gifts for Christmas. She's since built a king-size bed, dining table and toy box. She also makes her own cleaning supplies and grows some of her family's food, too."