It takes a lot of energy to walk around and locate and harvest and process and prepare wild edibles. You might expend more in work.calories than you ingest. In winter, they would sit quietly to conserve energy. only madmen waged war in winter. Typically only desperate fools went scavanging for food in winter as you would probably get a chill and get sick and were likely to fail.

This is why our ancestors had PACKED pantries as they worried about lean years and famines and blights and ibfestations with poor harvests. A full pantry with inexpensive dried food will help your family cope in a frugal way.